A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

A park full of outsider art, created by college students studying outsider art.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Instead of fruit, the branches of this tree are brimming with hopes and dreams.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Mile-long cave system near Great Smoky Mountains.

A unique sculpture park that specializes in the huge and bizarre.

Lavish royal estate punctuated with heated greenhouses.

One of Ireland's most infamous prisons for rebels including men, women and children.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

A three-story tower of books about Abraham Lincoln is one of the more unusual monuments to the president.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

The loneliest island in New York.

An Aztec snake god has taken the material form of an apartment complex.

This artificial cave looks like something out of a fairytale.

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

Abandoned concert venue legendary for its rock counterculture.