We've always been a naturally inquisitive species, as our ability to think for ourselves and look outside of our consciousness means that the word is a much more interesting place to us than it ever was to the other animals that exist on this planet. This is why some people have dedicated their lives to looking into the world around them in the hope of discovering something new. This includes digging deep into the Earth, whether for bones, or maybe something a little more sinister...

Yes, what we've done is pulled together some places underground that were discovered, but we're not too sure they should've been. Places like this always have some sort of story, and while they're not always worrying, they do often come with problems that have to be looked at. That's just the sort of cold reality that comes with places that were built underground, as there has to be a reason they're not above ground!

So, we think it's about time that we all had a look at some of the places that have been hiding underneath our feet! We know that there's no way that anyone here will know about all of the places we've collected for the list!

25 Egyptian Underground Labyrinth

Egypt is best known for the Pyramids, an amazing set of sculptures that continue to surprise to this day. However, AncientPages claim there's even more to be interested in!

"The Labyrinth of Egypt has been described by a number of ancient writers such as Herodotus, Strabo, Diodorus, and Pliny. This legendary complex, named the "Labyrinth" by the ancient Greeks is believed to be an enormous collective tomb of the twelve kings."

Egyptian leaders seemed obsessed with being remembered, entombed forever after they've passed on, so this makes sense!

24 Bunkers Of Berlin

"Berlin has one of the most extensive subterranean cities in the world, packed with citizens during the air raids in 1945. The remains of murals can still be seen, as well as the tunnels which were meant to run under the fantastical city of Germania." The Guardian have described a set of underground tunnels that we really want to see, the sort of place that will have a lot to take a look at! Sure, it might get a little bleak down there, but it would be well worth it.

23 Grand Canyon's Underground City

"Ever since an intriguing article reporting the discovery of a great underground citadel of the Grand Canyon appeared in the Arizona Gazette in 1909, scientists have debated whether the story is true or a hoax."

We would rather believe AncientPages when it comes to the Grand Canyon's underground city.

It's always better to think that this world has unconfirmed secrets, the sorts of things that we'll never be able to truly understand, no matter how much we want to!

22 Underground City Of Derinkuyu

Can you imagine stumbling across one of these places?! AncientPages tells the story of a young man who did just that!

"In 1963, approximately 50 miles (30 km) south of Nevsehir, Cappadocia, Turkey, Omer Demir stumbled across a deep hole (in Turkish: derinkuyu) that led to a steep path leading deeper down to passages, niches and shafts dug into the bedrock."

To think that there could be something right below us now, waiting for us to discover it. Kind of scares us to be honest!

21 Jurong Rock Caverns

"Space has always been tight in Singapore, which is why the Jurong Rock Caverns – 150 acres of prime underground real estate, 100 metres underground – are being used to house 4,200 scientists as well as oil and gas reserves."

This is the smartest way to put this sort of thing to use, placing people inside who can properly use it, as it offers them what they need!

Housing reserves and supplies down there is also a genuine work of genius.

20 Lalibela

History.com wants people to know about the underground cities that have taught us about the times that have passed. As they describe the city of Lalibela, "all of its churches were hewn from volcanic rock below the earth’s surface then hollowed out, giving them the appearance of having grown directly out of the ground." If you ask us, this is quite possibly the most impressive city on this list, so we suggest that people take a look if they ever get the chance to.

19 City Of The Gods

TheCultureTrip describe this place best, claiming that "visitors may not know that there is a secret, and wholly abandoned city hiding underneath the ancient structures. Made up of chambers and tunnels, researchers didn’t begin researching the space until 1978, and upon finding it, they began mapping out how the city comes together." Believe it or not, but this place can be found underneath the Pyramids, one of the most famous places on Earth.

18 Shanghai Tunnels

Some of these places are just made for the look, but other places were a necessity. "This intricate network reportedly once consisted of tunnel passageways linking Portland’s Old Town, also known as Chinatown, to the central Downtown area. Unfortunately many of these subterranean spaces have been filled in during various public works projects, but a few of them are still there and open to explore." Momondo highlight that some of these places are still open to the public.

17 Setenil De Las Bodegas

"Located along a narrow river gorge that’s eroded by the Rio Trejo, the houses are built into and under the walls of the gorge itself. People actually settled here for practical reasons: in order to keep out the summer heat and the cold in the winter." Amazing to think that this place ended up existing out of practicality, not because of spectacle. Most people would've guessed otherwise, which is why we're glad that Momondo claim otherwise.

16 Lost City Underneath Missouri

"On April, 1885 a very interesting article appeared in The New York Times. Readers were informed that Mr. David Coates, the Recorder of the City of Moberly, and Mr. George Keating, City Marshal discovered an ancient wonderful lost city beneath Missouri."

AncientPages is reporting here on an ancient lost city below Missouri, something that we've never heard of before!

We hope that this one is real because, we just love the concept that the people of Missouri have no idea that they're walking over an entire lost city!

15 Taklamakan Desert City

We do understand that underground areas of the world have been found, but have yet to be fully explored, which makes them even more interesting.

AncientPages admit that there is still a lot that needs a proper look about this Desert City!

"Archaeologists are beginning to discover some of the secrets that have been hidden in this mysterious region. Still, it seems that we are only scratching the surface and only time will tell what more wonders are waiting to be unravelled."

14 Italy's Underground Pyramid

The pyramids are one of the most famous structures of all time, but we don't think about Italy when they come up!

"Deep beneath the city of Orvieto, Italy, there are a series of underground structures connected by tunnels. According to sources, during the 6th- 4th centuries BC, the town of Orvieto was a culturally and economically developed Etruscan city."

Yes, underneath Italy there is a series of underground pyramids and tunnels that once served as a city to a past people. Who knew?!

13 Orvieto Underground

"Beginning with the ancient Etruscans, generations of locals burrowed their way deep into the volcanic rock bluff on which the city was originally built. The subterranean maze was first carved to build wells and cisterns, but over the centuries it grew to include more than 1,200 interlocking tunnel" History.com describes a time when people would actually burrow underground when looking for somewhere to expand their living quarters, whereas we usually do the opposite now, building upwards.

12 Sonnenburg Shelter

"Swiss municipalities must provide nuclear fallout shelters for all citizens. Sonnenberg has an operating theatre and air filters sufficient for the needs of 20,000 people – although the discovery that the 350-tonne doors don’t close properly has led to the entire facility being dismantled" Now that TheGuardian pointed out that they have to do it in Switzerland, doesn't it sort of make sense that the rest of the countries around the world should be doing this as well? Where are our shelters?!

11 Burlington Bunker

Yet another chance for History.com to show off how interesting the past is when it comes to the various ways that human beings have worked their way underground. "In the event of a Cold War-era nuclear strike, the most important members of the UK government would have retreated to a 35-acre underground complex located 100 feet beneath the village of Corsham." Who knows how many different complexes have been built underground for the major leaders in this world.

10 Vicksburg Caves

"For 47 days in 1863, Vicksburg in Mississippi was laid siege by Yankee forces, with 16,000 artillery rounds fired into the town. Residents dug a complex network of caves, and only around a dozen people [lost their lives]."

Here we're told by TheGuardian by how truly impressive it can be when human beings are forced into a corner and have to come up with a way out of it.

It may bleak, but it's also pretty fascinating as well, so we're happy to have it on this list.

9 Edinburgh Vaults

"Opened in 1788, a period of great expansion and growth, the vaults date back to a time when Edinburgh was a superstitious place. Today, they still exude a feel of gore and ghastliness. Originally built to house taverns, cobblers, cutlers, smelters and other tradesmen, and to store illicit materials." The way that Momondo has described this place really puts it on our radar. We want to make sure that we see this place before it's too late, as it sounds like nothing else in this world.

8 Tunnels Of Moose Jaw

"In the beginning of the 20th century Canada imposed its now infamous head tax on  immigrants due to the worry that they would steal jobs away from locals. Afraid and unable to pay the tax, illegal immigrants were forced underground."

Such a sad reality like this should not be forgotten, which is why we're glad that TheGuardian is attracting attention to it.

Rather than a chance to freak ourselves out, this is a chance to consider a surprising history.

7 Dixia Cheng

China is one of the most fascinating countries in the world, offering things that can't be found anywhere else. However, as Momondo points out, there's things under the street level that are interesting as well! "Beijing’s underground city, Dixia Cheng, was built in the 1970s to serve as a shelter during invasions and nuclear attacks. The lengthy network of tunnels, often referred to as the Underground Great Wall, included almost 100 hidden entrances."

6 Shin-Au-Av Underneath Death Valley

AncientPages tells of place that exists underneath Death Valley, and already fascinating place that is well worth visiting depending on what you're looking for!

"According to those who entered the subterranean tunnels and visited this marvelous place, the city was once inhabited by an unknown race. Now, thousands of years later the place had been abandoned, but the visitors saw strange mummies and curious old artifacts."

The unknown race might not be true, but who's to say that this underground city doesn't exist!