An alchemist's "magic door" stands in the middle of a Roman park.

A submerged archeological park still holds the wonders of a Roman Sodom.

A 16th-century horror show built in a lovely Italian garden.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

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

This ancient sword lay in a waterlogged tomb for 2,500 years, but managed to remain relatively untarnished and impressively sharp.

A barbarous band of serpents guard the bases of these Aztec temples.

The outside of this exposed Moche pyramid is covered with striking colorful adobe friezes.

The world's largest statue of Mao Zedong looks out over the city where he discovered Communism.

A cliff-hanging restaurant.

At nearly 1,000 feet long, this astonishing glass suspension bridge is one of the longest in the world.

A dark Victorian well house now plays host to mystical waters and pagan shrines.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

This "Plant Farm Museum" is home to the divinely inspired and visionary outsider artwork of Reverend Howard Finster.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

This intricate Hindu temple is the largest of its kind outside of India itself and was constructed like a giant puzzle.

The statues commemorate the legendary mass killing of escaped circus monkeys.

Enormous lake at the bottom of a unique cave system.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

Mysterious library of an infamous financier and spiritual seeker.

One person's lost luggage is another person's treasure.

This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

More than five miles of underground passageways.

Crumbling ruins mark the site of a couple's grisly murder in the woods.