Our world is filled with mystery and fascinating legends and stories that up until this day, still cannot be explained. Scientist, explorers and archeologists alike continue to be astonished by how objects and certain natural phenomena have occurred and just so happen to make their way on our planet without any written history to back it up.

Archeologists have found secret tunnels in parts of Europe that still are a mystery to top historians who still question what they were really used for. In Costa Rica, there are over 300 perfectly rounded spheres that are commonly attributed to the Diquis culture but still remain a great unsolved archeological mystery. Let's also mention the Copper Scroll Treasure which is part of the Dead Sea Scroll, which apparently reveals the location of lost temple treasures that are yet to be found. These unsolved findings and more are what make our world that much more perplexing.

We've listed 25 mysterious findings on earth that believe or not, even the best scientist cannot explain, even with today's highly advanced technology. Were the people living in ancient civilizations more high-tech than we believed? And is there really a dinosaur-like creature living in the depths of the waters of the Scottish Highlands? These mysterious findings and legends continue to baffle us to this day and we might not ever understand how they came about.

25 The Lost City Of Atlantis And Its Unknown Location

The City of Atlantis has been one of the greatest mysteries of all time. This utopian society that ancient Greek philosopher Plato wrote about and that eventually sunk to the bottom of the sea is a myth for some, but others believe Plato's allegory had some truth to it. According to National Geographic, very few scientists believe an actual lush island with a variety of exotic animals really existed. However, ocean explorer Robert Ballard believes that the legend of Atlantis is a "logical" one since there have been cataclysmic tsunamis and volcanic explosions that could have caused a nation to disappear. Still, the Lost City of Atlantis remains a mystery and for now, is just a story about people living in a utopian civilization.

24 Nazca Lines In Peru

In southern Peru, you will find the Nazca Lines. These mysterious lines are a series of ancient geoglyphs in the Nazca Desert with the largest figure being 1,200 feet long. Experts believe that these lines, with some resembling Paracas motifs, where created by the Nazca culture between 500 BCE and 500 CE. Many of these large geoglyphs are just simple lines and shapes, while others are more complex and resemble animals, including birds, llamas, fish, monkeys, and even human figures. Removing natural reddish pebbles and uncovering the white ground underneath created these ancient figures. There isn't any real reason as to why these lines were created; however, scholars believe they have religious purposes.

23 Gobekli Tepe In Turkey

Located in southeastern Turkey, the construction of Gobekli Tepe dates back almost 12,000 years, which puts it at a time period considered to be pre-civilization. According to Ranker, the site was built around the same time the last ice age ended. Gobekli Tepe is such an old and ancient site, that it predates Stonehenge by over 6,000 years. The site is also pretty impressive because there are skilled architectural styles seen in the construction of the many temples and the craftsmanship is a thousand years ahead of its time. The site is truly a wonder and has had archeologists re-thinking the start of civilization. However, the details of the site’s function remain a mystery.

22 Mystery Hill In New Hampshire

Mystery Hill is known as America's Stonehenge mostly because it is made out of stone, with experts claiming it to be either a 4,000-year-old megalithic astronomical complex built by the Native American culture, the lost monastery from migrant Irish monks, or the misinterpreted work of 18th and 19th-century farmers. Mystery Hill is located Salem, New Hampshire and is possibly America's oldest archeological site. Atlas Obscura states that the site consists of a series of small stonewalls, odd stone arrangements, and underground chambers. Despite all the possibilities as to who built it and why it was used, the site continues to puzzle archeologists.

21 Roman Dodecahedrons In Europe

Roman dodecahedra date back from the 2nd or 3rd centuries AD and are small hollow objects made of bronze or stone with twelve flat pentagonal faces, and each face having a circular hole. These objects have been found all across Europe, from Wales to Hungary, and Spain to the east of Italy. About 100 of them have been found and the mystery is that none of these bronze objects have been found in accounts or pictures of that time. There are speculations as to what these objects were used for, such as candlesticks, dice, estimating distances, or gauges to calibrate water pipes.

20 The Copper Scroll Treasure, Part Of The Dead Sea Scrolls

The Dead Sea Scrolls are ancient Jewish religious manuscripts found in the Qumran Caves in the West Bank near the Dead Sea. The Copper Scroll is one of the Dead Sea Scrolls, however, what makes it unique is that it is written on metal, unlike the others, which are written on parchment. It is not a literary work like the Dead Sea Scrolls, but pretty much a treasure map listing places where gold and silver are buried. Also, Ancient-Origins states that its author, script, style, language, genre, content, and medium differ to all the other scrolls, which make scholars believe that that it must have been placed in the cave at a different time. Over 4,600 precious metals are listed on the Copper Sea Scroll, making the total amount of metal, if found, worth billions of dollars.

19 Derinkuyu In Turkey

There is an underground city named Derinkuyu in Turkey that is purely astonishing. It is an impressive geological site that people used for shelter across the centuries to hide away from invasions. According to Historic Mysteries, Derinkuyu is an eighteen level complex, which was formed by an inhabitant of ancient Anatolia who realized they could carve out their homes right into the hillsides and underground after volcanic eruptions spewed layer of ash called tuff and the tuff cemented into a soft and carvable rock. Researchers found kitchens, bathrooms, dwellings, food storage rooms, wine presses, churches, schools and weapons storage areas in the complex. The underground city has a capacity of up to 20,000 people and had everything a population could need if they had to hide from invaders.

18 The Hypogeum Hal Saflieni Temple In Malta

Malta's Hypogeum is considered one of the world's best preserved prehistoric sites, featuring a complex of cave chambers including temples, a cemetery and funeral hall. The underground burial chamber is 6,000 years old found on the small island of Malta. It is considered one of the first and famous complexes with the purpose of ritualizing life and death, according to the Smithsonian. The middle level of this complex is the most ornate area, with researchers believing it was where the bulk of ritual activity took place and where you'll find the "Holy of Holies" room, which looks like a carved out temple. Visitors can walk through the Hypogeum and learn a thing or two about its importance.

17 Puma Punku In Bolivia

One of the world's most ancient and mysterious sites is Puma Punku in Bolivia. Puma Punku covers a large part of the ancient city of Tiwanaku and predates Inca presence. Puma Punku is part of a large temple complex that is believed to date to AD 536 and later. The complex consists of an unwalled western court, a central unwalled esplanade or promenade, a terraced platform mound, and a walled eastern court. To this day, these structures are a mystery because it isn't quite known who built these structures, how they were built, and why they were built. It is a true wonder how inhabitants of this region were able to build Puma Punku since it seems impossible that they could have cut stone without the proper tools.

16 The Longyou Caves In China

There is an extensive and ancient underground world located near the village of Shiyan Beicun in Zhejiang province, China that is truly outstanding. The Longyou Caves are believed to date back some 2,000 years, first discovered in 1992 and cover a massive 30 meters. Inside the underground world, archeologists discovered stone rooms, bridges, gutters, and even pools. Experts from all over the world still have no idea who built the caves and why. The caves are advanced, with pillars supporting the ceiling and columns are uniformly decorated with chisel marks. Scientists claim that the Longyou Caves could not have been built by regular village people, but possibly commissioned by an Emperor.

15 The Bolshoi Zayatsky Labyrinths Off The Coast Of Russia

The stone labyrinths of Bolshoi Zayatsky Island are a group of 13 or 14 labyrinths in Russia that are said to be about 2,500 years old. No one knows why the ancient labyrinths were built on this small island and they look like they came straight out of a fantasy movie. The island is less than one square mile in total and the group of labyrinths practically covers it. While archeologists can't figure out who made them, they agree that these labyrinths were used for mystical use. According to Atlas Obscura, their purpose could have included a portal to the underworld, a trap for evil spirits, or the altar of a ritual ceremony.

14 Qin Shi Huang's Tomb

One of the biggest finds in archeological history was in 1974 when Chinese farmers dug up the life-sized terracotta army of Emperor Qin Shi Huang. These impressively carved clay statues were used to defend the first Chinese emperor in the afterlife, so it wasn't a mystery as to why they were created. What is a mystery, however, is that researchers don't know exactly where the emperor is buried or what treasures he may have buried alongside him. Emperor Qin Shin Huang's final resting place is extravagant and basically an underground palace, complete with a surrounding "kingdom," according to ancient documents which describe the tomb.

13 Stone Spheres In Costa Rica

In the deep jungles of Costa Rica, you can find over 300 perfectly shaped spheres that vary in size from a few inches in diameter, to seven feet across and weighing a massive sixteen tons. These round balls, known as Las Bolas (The Balls), where sculpted from gabbro, the coarse-grained equivalent of basalt, while there are a few that are made from shell-rich limestone, and another group of these spheres made from sandstone. While archeologists have agreed that these perfectly shaped stone spheres are the work of ancient indigenous people and that these balls were put in lines along the approach to the house of chiefs, researches still have no idea about their true meaning or significance.

12 The Cochno Stone In Scotland

Located in West Dunbartonshire, Scotland is the Cochno Stone, a stone with dozens of grooved spirals, carved indentations and mysterious patterns that is still a mystery to this day. The Cochno Stone is considered to have the best example of Bronze Age cup and ring carvings in the whole continent of Europe, reports Ancient-Origins. The stone carvings were created 5,000 years ago and are covered in more than 90 carved indentations. The cup and ring marks on the stone are a form of prehistoric art and measures 42 feet by 26 feet. There have been many theories on what the Cochno Stone is. Experts believe it could either be a form of ancient writing, religious markings, star maps or just decorative markings.

11 Voynich Manuscript Housed At Yale University

There is a mysterious and undeciphered book housed in Yale University's Beinecke Rare Book and Manuscript Library called the Voynich Manuscript that dates back to the 15th or 16th century. This manuscript is covered in undeciphered text and drawings that no expert has yet to understand. According to Yale University, the manuscript is described as having "magical or scientific text" where almost every single page contains botanical, figurative, and scientific drawings of a "provincial" but lively character drawn in ink with vibrant washes in various colors. What we do know is that the manuscript is from Central Europe, and named after the Polish-American antiquarian bookseller, Wilfrid M. Voynich, who received the manuscript in 1912.

10 The Khatt Shebib In Jordan

An ancient wall in Jordan continues to puzzle archeologists because they have no idea who built it and what its exact purpose is. The Khatt Shebib is a 93-mile long wall of stone, which was first reported back in 1948 when British diplomat Sir Alec Kirkbride discovered it while traveling by plane in Jordan. According to Live Science, archeologists have discovered that the wall runs north-northeast to south-southwest over a distance of 66-miles. Scientists have only figured out that this mysterious wall, thanks to the pottery found near it, was likely built between the Nabataean period (312 B.C.-A.D. 106) and the Umayyad period (A.D. 661-750). The purpose of the wall is also a large mystery since it isn't a tall wall, which means it wasn't built for defensive purposes. However, researchers explain that ancient agriculture is noticeable to the west of the wall than the east, which might mean that the structure marked a line between ancient farmers and nomadic pastoralists.

9 Aluminum Wedge Of Aiud In Romania

Workers in Romania found the Aluminum Wedge of Aiud in 1974 and what puzzles archeologists is that this five-pound wedge is composed of 89 percent aluminum, with traces of copper, zinc, lead, cadmium, nickel, and other elements, but because aluminum isn't found in nature, it must be manufactured and aluminum had not been produced since the 1800s. The object was found next to mastodon bones, so if the wedge is the same age as the bones that means the mysterious piece is at least 11,000 years old. Others believe that this small piece is evidence that extraterrestrial beings visited Earth in the past and left the aluminum wedge.

8 Coral Castle In Florida

Coral Castle in Florida is a remarkable place and surprisingly built by hand by one man named Edward Leedskalnin, who set out on a quest to create a monument for the woman who left him. It is quite astonishing that this man cut and moved huge coral blocks using only hand tools. Ed built the Coral Castle himself, even carving and sculpting over 1,100 tons of coral rock and left people wondering how a small man of five feet, weighing only 100 pounds could move these large blocks of coral, where some can be up to 4,000 feet thick. It took Ed 28 years to complete his masterpiece and the Coral Castle continues to blow visitors away.

7 The Antikythera Mechanism Found In The Aegean Sea

This ancient Greek analog computer was used to predict astronomical positions and eclipses for calendar and astrological purposes. The Antikythera mechanism was found among wreckage from the coast of the Greek island Antikythera in 1902. This advanced mechanism was designed by Greek scientists dated about 87 B.C., or between 150 and 100 B.C. It is an extremely impressive device composed of at least 30 meshing bronze gears and 37 gear wheels allowing it to follow the movements of the moon and the sun, predict eclipses and model the irregular orbit of the moon.

6 The Loch Ness Monster In Scotland

We've all heard about the Loch Ness monster and for years, explorers have been trying to find this dinosaur-like creature that supposedly lives in Scottish waters. While the famous photo of "Nessie" from 1934 is now known to be a hoax, people still believe there is a creature, with a long neck and one or more humps lurking in Loch Ness in the Scottish highlands. The Loch Ness monster has become a legend but has become a famous mystery over the years. To this day, there is no conclusive evidence that a long neck "Nessie" lives in these waters; however, observers are convinced that they have spotted a large creature in the water.