The United States can be a pretty strange place. There are rocks that move on their own in the desert, an island whose entire population has vanished all at once, boulders that ring like bells, and a flame that never stops burning. People travel from far and away from seeking spiritual awakening from the top of Mt. Shasta to the valleys of Sedona, Arizona. There are some things on American soil that even the most educated scientists haven't been able to explain.

UFO sightings and flying saucers make up many of American culture's most well-known myths of the supernatural variety, but not all of its most mysterious places employ conspiracies about aliens like Area 51. Others involve an ancient man who levitated rocks to build a castle, potential proof of a biblical flood, and an energy hotspot that makes its visitors grow taller and shrink. These peculiar places still exist in every corner of the country, so you can see them with your very own eyes and determine what you believe in for yourself. Here are 20 places in the US that are more mysterious than Area 51.

19 Mel's Hole, Washington

Named after Mel Waters, the man who discovered it mere decades ago, Mel's Hole is apparently bottomless sinkhole somewhere — no one knows exactly where — in Ellensburg, Washington. When Water's phoned in the mysterious and infinite pit, he said that upon measuring it with the tied-together fishing line, the hole was more than 80,000 feet deep. The unconfirmed fable was nearly put to rest when, according to local news station KNKX, nobody by the name of Mel Waters even existed in Ellensburg. However, the incident made headlines again in 2012, when a medicine man called Red Elk told a Seattle TV station that he had been acquainted with the hole since the '60s, thus the mystery of Mel's Hole remains.

18 Underwater Stonehenge, Lake Michigan

You've probably heard of Stonehenge, a prehistoric monument in England that's also one of the New Seven Wonders Of The World. Well, one college professor of underwater archaeology said in 2007 that he discovered a similar monument 40 feet below the surface of Lake Michigan. According to WhereTraveler, the underwater rock shrine makes a circle and one of the rocks is apparently decorated with a carving of a mastodon, an elephant-like animal that became extinct during the Pleistocene. The only explanation scientists have so far is that the stones were placed there when the lake was dry, during the last Ice Age, but some wonder whether they were placed there purposefully at all.

17 Skinwalker Ranch, Utah

Also known as UFO Ranch, Skinwalker Ranch is a 500-acre plot of land near Ballard, Utah. The Native American Ute tribe that occupies a bordering Indian reservation won't step foot on the eerie estate because they say it's the path of the Skinwalker, Thought Catalog says. What's a Skinwalker, you ask? According to the Utes, Skinwalkers are spiteful spirits that the Navajo tribe sicked on them generations ago, and at Skinwalker Ranch they still roam. The family that lived there in the '90s didn't help to disprove the superstition, as they abandoned the property after only two years because they were being plagued by unexplained livestock mutilations, crop circles, and levitating objects, Thought Catalog says.

16 Racetrack Playa, California

They call this bone-dry lake in California's Death Valley National Park "The Racetrack" because it is here that rocks drift mysteriously with no wind, water, or other natural force to propel them forward. Even the National Park Foundation calls it one of the world's strangest phenomena, especially because the sailing stones leave racetracks to mark their paths, but nobody has ever actually seen them move. There are several scientific theories that have attempted to explain this natural wonder (none of which have been decided upon as fact), but we're sticking with the theory that the stones have secret feet and move around like characters in Toy Story.

15 Roanoke Island, North Carolina

During the 16th century, the governor of Roanoke Island left on a supply trip to England and when he came back, everyone on the island was gone. The island whose inhabitants disappeared out of thin air is no urban legend. According to The History Channel, there was no sign of violence or any clues about their mysterious vanishing at all save the word "CROATOAN" carved into the palisade that surrounded the colony. It would make sense to assume that the civilians had moved to Croatoan Island, then, but a later search of that island revealed that they were never there.

14 Horseshoe Canyon, Utah

Many people make a pitstop at Utah's Horseshoe Canyon on their way to the popular Canyonlands National Park because of the ancient relic's significance in American history: it was used as a natural canvas for rock carvings 2,000 years ago. However, the creepy thing about the Great Gallery — as this portico of pictographs has been named — is their supernatural subject matter. The unsettling Native American drawings depict silhouettes of creatures that some say look like aliens, or demons, or gods from the underworld, according to the Natural History Museum of Utah. And if they are, then how did the Anasazi people know what they looked like?

13 Horseshoe Bend, Arizona

Not to be confused with the aforementioned Horseshoe Canyon, Arizona's similarly named Horseshoe Bend is equally peculiar because of its strange shape. Typically, when water cuts through rock, it creates a straight path. Rarely, though, does it make a full 180-degree U-turn as the Colorado River does at Horseshoe Bend. Some people think that the unusual, seemingly unnatural shape of Horseshoe Bend was caused by the biblical phenomenon known as Noah's Flood, where God decided to return the earth to its pre-creation state by inundating it with water.

12 Coral Castle, Florida

As the story goes, 26-year-old Edward Leedskalnin of Latvia moved to Florida during the 1920s and bought a vacant plot of land where he would settle into his new life in America. The only problem was that he had no house, no money, and no one to help him build one. Over the decades, he built an estate all by himself with no equipment, and some of the stones that the structure is comprised of weighing up to 27 tons. If you visit Coral Castle today, you can see that all the stone pieces fit together seamlessly without mortar, and the tallest monolith is a towering 25 feet tall, beckoning the question: how did Edward do it?

11 The Grave Of The Female Stranger, Virginia

One of the most famous graves in the country is in Alexandria, Virginia, though no one knows who lies in it. The grave of the "Female Stranger" has become a major tourist attraction in St. Paul's Episcopal Church Cemetery because the woman who is buried there is mysteriously anonymous. Legend has it a 23-year-old woman died in room 8 of Gadsby's Tavern in 1816, Roadtrippers says, and when her husband had her buried, he chose not to put her name on the gravestone — but why? Some say they see her ghost wandering the halls of Gadsby's Tavern and the cemetery grounds still today.

10 Devils Tower, Wyoming

Scientists still can't quite figure out how or why Wyoming's Devils Tower National Monument exists. Some have theorized that this colossal stone structure, jetting out from the vast nothingness of middle America, is a volcanic plug, while others say it's actually the neck of an extinct volcano itself, but the Native Americans are not buying those hypotheses. Indigenous tribes have their own stories, including one about two girls who were being chased by dangerous bears and when they dropped to their knees to pray for safety, a higher power lifted the ground on which they stood. The bears' claw marks are still embedded, they say, on the sides of the rock monolith.

9 Bighorn Medicine Wheel, Wyoming

Just down the road from Devils Tower in Lovell, Wyoming, Native Americans have built a ring of rocks that are meant to predict astronomical events, Atlas Obscura says. The 80-foot-across stone circle replicates the shape of a wheel and sits on the peak of Medicine Mountain, which is covered in snow for most of the year. The wheel's 28 stokes are said to represent the 28-day intervals between heliacal risings. While there are a number of other sacred loops like this around North America, Bighorn Medicine Wheel is one of the most thoroughly studied and preserved. The peculiar constellation is still used now by Native Americans and others to predict the summer solstice.

8 Oregon Vortex, Oregon

Could this odd spot in Oregon have the power to change people's heights? That's what some say about the Oregon Vortex. Tourists gather at the bizarre spectacle because they seem to grow taller and shrink within seconds as they move around the so-called House of Mystery. Here, balls roll uphill and visitors reportedly lose their balance. The best way scientists can explain it is that the hotspot is a "whirlpool of force," according to Oregon Live, with magnetic energies that make you appear taller as you walk north and shorter as you walk south. It's been a roadside attraction for 90 years.

7 The Georgia Guidestones, Georgia

There's not much going on in Elberton County, Georgia, with a population of fewer than 5,000 people, besides the fact that it is home to a massive ancient relic that you probably don't even know about (but should). Reminiscent of England's Stonehenge, the Georgia Guidestones are massive granite slabs that are stacked atop one another and meant to serve as an astronomical calendar. Built in 1979, the mysterious rock monument also has inscribed on it 10 guidelines to re-establish earth and society in case of an apocalypse. "Let these be Guidestones to an Age of Reason," it says.

6 Roswell, New Mexico

Perhaps the incident that sparked people's curiosity about Nevada's mysterious Area 51 was the supposed UFO sighting in Roswell, New Mexico, in July 1947. That summer, the Roswell Daily Record published an article proclaiming that a flying saucer had been captured and was being kept on a ranch in this Southwest town. Even the Roswell Army Air Field issued a press release that called this anonymous debris a "flying disc," The Week says, but they later changed their story to say that it was only a crashed weather balloon. Conspiracists believe it's one example of the US government covering up alien activity.

5 Mystery Hill, New Hampshire

Aside from the Georgia Guidestones, there is actually another archaeological site on US territory that some call "America's Stonehenge." On Mystery Hill in New Hampshire is a series of stone walls that are believed to be 4,000 years old. Some claim they were built by Native Americans, others say it's wreckage from an ancient group of Irish monks' lost monastery, and a handful of archaeologists say the rocks were placed there by farmers during the 18th century. No one knows how the stones really got there, but this acre-wide outcropping features strange underground bunkers and odd built-up structures with drainage ditches carved into them.

4 Sedona Vortexes, Arizona

Sedona, Arizona, is said to be home to spiritual vortex sites where the earth's electromagnetic energies intersect. These ley lines or vortices, as they're also often called, have a reputation for being natural healers. As if the red rocks of the desert aren't conducive enough to meditation on their own, there are certain hotspots here — Airport Mesa, Cathedral Rock, Bell Rock, and Boynton Canyon, to name a few of the most popular — that are thought to carry an even more intense energy where it apparently enters and exits the earth, Visit Sedona says.

3 Mount Shasta, California

The snowy cap of Northern California's Mount Shasta has long been a spectacle for tourists, but not just because it's beautiful. The mountain is, of course, a postcard-worthy sight, but NPR says that it's Shasta's spiritual significance that also draws people in. The spiritual seekers who have come to visit — and often times stayed at — Mt. Shasta say the mountains were calling them and they just had to go. The Native Americans see the majestic peak as the home of their creator and hold sacred ceremonies on the mountain to this day.

2 Ringing Rocks Park, Pennsylvania

Ringing, sonorous, lithophonic — people call these peculiar boulders a plethora of names, but everyone agrees on one thing, and it's that they ring. Striking the Ringing Rocks in Bucks County, Pennsylvania, will let off an audible bell tone as if they're hollow. Of course, they're not hollow, but scientists are still perturbed by what actually makes them so musical. It could be because they're made of diabase, which is also the type of rock that composes the earth's crust. Whatever the case, be sure to bring a hammer to this 123-acre park and take the rare opportunity to play a tune with one of nature's most interesting instruments.

1 Paulding, Michigan

There is a light that shines from a mysterious source in the woods of Michigan. People are so curious about the source of the light that Ripley's Believe It Or Not once offered a $100,000 reward to whoever could figure it out, but still, no logical explanation has emerged about where the Paulding Light comes from. Some say the light starts over Lake Superior and travels inland. People have even caught it on camera shining and bouncing on the horizon at night. Local news stations often play the videos and the Michigan Forest Service has posted signs telling tourists where to catch it best. Needless to say, Paulding natives are accustomed to the bizarre phenomenon that's happening in their tiny town.