Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

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

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Rare recess caves fill this unbelievably beautiful Ohio park.

A grove of "candelabra redwoods" deep in California's Lost Coast.

There's something big lurking beneath the surface of this tiny Oregon park.

This park in Nagarkot boasts one of the best views in all of Nepal.

The first hospital in the New World.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

A wondrous old library overlooking the nation's capital.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.

This temple contains what might be the world's oldest optical illusion.

Countless grotesque faces stare out from this eerie Prague art wall.

In the loving memory of a tragically deceased role-player this Illinois park is decked out with both dungeons and dragons.

Nature took her revenge on the "Wickedest City in the World."

America's original house of worship for Spiritualism, the religious movement based on communing with the dead.

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

The original place where water met land in the City by the Bay is outlined in brass.

An intricate and amazing house built by architect Karl Junker.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

Norway has built what may be the world's most beautiful public toilet.