Italian cave with exceptional acoustics and an unsavory history.

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

Ancient snack bar of the Roman Empire re-opened.

This winding road through an Italian canyon may be the most scenic drive in the world.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Romans built the world's tallest artificial waterfall in 271 BC.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

Pilgrimage site for star-crossed lovers.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

Go inside to really appreciate this 500-year-old technological masterpiece.

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

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

Azerbaijani ghost town, decaying after a war left it an armed forces buffer zone.

Lonely minaret stump of a destroyed city.

This retro, UFO-like structure is a remnant of the Soviet-era circus.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

This exquisite, alienesque piece of Soviet architecture is being threatened by modern shopping malls.

This oddly shaped building is a surprising Soviet-era crematorium.

The deepest metro station in the world.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.