An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

Walk through Czech history in Prague's largest graveyard.

Macabre astrological automaton clock dating to the late 1400s.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Left untouched since a double murder-suicide in the 1960s, Los Feliz murder mansion remains a neighborhood mystery.

A bizarre house filled with an astounding array of collections.

The Emperor Tiberius' palace of debauchery.

Ruins of a 10th century church tucked away deep in a botanical garden.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Pompeii's less famous neighbor is still revealing her secrets.

Erotic art covers the walls of the largest ancient pleasure palace.

The incorrupt tongue of the patron saint of lost things is venerated in this basilica.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

An artist's mausoleum with a haunting echo.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Abandoned medieval hill town.

Europe's second largest ossuary wasn't discovered until 2001.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.

The final resting place of the poets Shelley and Keats.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Jesus' footprints and the first catacombs in the world.