Civil War dumping ground for the bodies of terrorized Union sympathizers.

A popular swimming hole that hides one of America's most deadly diving spots.

An emerald-green grotto just a short trip from Austin.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

To honor a beloved Austin radio DJ a neighborhood bridge has been covered in a loving mosaic.

Continuing the tradition of the dime museum in style.

Turning night into day in Victorian-era Austin to thwart a serial killer.

Crumbling hotel echoes with the sounds of the '30s.

This small town Texas cemetery is said to be the burial site of a UFO pilot who crashed in the 1800s.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

The oldest continuously operating church in California.

Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Gold Rush-era tombstones line the park's paths.

Radioactivity still cause for concern at this urban explorer's paradise.

A 140-year-old castle with underground caves hidden in San Francisco.

A vast city of the dead, where the deceased outnumber the living by more than a million.

A rough granite monument marks the spot where Europeans first caught sight of the San Francisco Bay.

Yemen's "Stone Palace" looks like it was carved right out of the tall stone column on which it is built.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

A stealthy Apache hideaway that became the haunting site of a mass grave.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A German apartment building hosting as many trees as human occupants.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.