Cliffside houses provide a spectacular view from their perch above the valley.

Village situated on a narrow volcanic escarpment.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

A 17th-century mosque that was used for war more than worship.

200-foot-high minaret and only remnant of Afghanistan's lost city of the Turquoise Mountain.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

Despite finally receiving electricity in 1970, this tiny town is now deserted.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

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

The Uros people live on floating reed islands in lake Titicaca.

An ancient city exhumed from the depths of the ocean.

More than 100 monumental tombs carved into rock are preserved at this ancient Nabataean site in the Arabian Desert.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

The world's most active stratovolcano is almost always erupting.

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

One of the tallest mountains in India was closed for years after a botched CIA mission.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

This everlasting lightning storm may be the world's largest generator of ozone.

The angel of death appears to weep black tears at this grave marker.

A fiery crater has been burning in the Karakum Desert since 1971.