There's a strange stone hoodoo towering atop a wooded hillside and no one is quite sure how it got there.

One of the last doorless, continuously moving elevators still in use in the U.K.

A brick-paved former section of the historic coast-to-coast highway.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Take a walk in a recreation of ancient Rome.

One of the largest burial mounds in the Netherlands and Belgium.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

A stunning two-story timepiece within a medieval Brick Gothic church.

Historical etchings such as “Miserable, wild, distracted 1350" and “The Archdeacon is an ass.”

This German fountain of a legendary apple wine-loving drink thief will spit on you.

Iran's colorful terraces are a rare geological masterpiece.

This giant, 83-year-old ship elevator is an engineering feat to behold.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

Dancing skeletal figures pay homage to a medieval mural destroyed during World War II.

An ancient burial ground believed to have been used for ritual sacrifice.

The monumental home of Prussia’s eccentric "Cannon King."

A disastrous D-Day rehearsal was relatively unknown until this sunken tank was discovered 40 years later.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

A remote hilltop covered in giant monoliths haunts the Brittany countryside.

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

The fountain marks the area where hundreds of accused witches were burned at the stake.