The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

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.

This foolish Victorian sea fort was converted to a deluxe hotel.

This nightmarish children's plaything was left grotesque to help kids conquer their fear.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.

Cavernous opening completely encased in Karst limestone.

You may get stranded and everyone's peeing in the water, but at least there's cocktails!

This abandoned oil depot produces world's longest echo in a manmade structure.

This spectacular mosque houses the second-largest chandelier in the world.

A hidden oasis just two minutes from downtown Atlanta.

Mysterious craters may have been home to an ancient cult.

The world’s tallest outdoor lift stretches along the stone pillars that inspired the floating mountains in the movie “Avatar.”

Spend the night in this formerly abandoned traditional Scottish village.

Explore the dark underground corridors of this graffiti-covered former military fortification.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

The centuries-old trees lining both sides of this dirt road may become Madagascar's first natural monument.

An exquisite grouping of structures made from 10 tons of invasive saplings.

The "last unrestored grand mansion of Savannah" is now a cramped, mouldering maze of antiques.

The massive machine creates cracking displays of indoor lightning.

This neo-Gothic monastery offers a rare chance to witness the unique maned wolf right up close.

A subterranean world of tunnels links several buildings of this rare 19th-century asylum.

One of the tallest statues in the world, and the tallest statue of a goddess in Japan.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.