Take a dip beneath the stalactites in this amazing cenote.

These winged Maya figures are the subject of speculation and conspiracies.

This popular cave pool is truly magical, despite the crowds.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

One of the few places where you can visit a cenote and Maya ruins at the same time.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

This Federal-style plantation house was once visited by Abraham Lincoln to meet with generals during the Civil War.

Pennsylvania's own Roswell-style UFO mystery.

Beyond the usual stories that attend old prisons, this one has deep bloody undercurrents.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.

A cult archaeology conspiracy theory claims these West Virginia petroglyphs were written by Irish monks in Ogham.

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A church of bones, decorated with 40,000 human skeletons.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.