These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

This highest peak in Idaho can only be reached by traversing a formation known as "Chicken-Out Ridge."

Natural rock water slides hidden in the remote forests of northern Idaho.

A wild west land agreement was etched right onto this historic Idaho stone.

Home to the deepest rift anywhere on Earth.

The "worst battleship ever built" is enjoying a grand second act, submerged 30 feet in the Gulf of Mexico.

An underwater statue of Christ blesses the depths off Key Largo.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

A mysterious inscription may hold a clue about the "Lost Colony" of Roanoke.

The mysterious 855-foot zigzagging stone wall has been baffling people for centuries.

Two flush headstones mark the only known graves to be embedded in an airport runway.

This stone is a marker of one millionaire's personal vendetta against gravity.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

This lighthouse was crafted as penitence for the theft of wine bound for a monastery.

The house in the middle of the motorway.

Eyam took steps to quarantine themselves and keep the plague from spreading.

The "Mona Lisa" of funerary art.

Fortifications built for a Soviet invasion that never came now sit abandoned in a losing battle against nature.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

Inside this museum is an ongoing excavation of an ancient shipwreck.

An allegedly cursed tree represents a town's reckoning with a racist past.

An actual 1957 Cadillac De Ville, encased in 15 cubic yards of concrete.

Abandoned businesses, homes, and rusted cars are all that remains of this stopover town.