An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Underground monastery and fortress.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

Pilgrimage site for star-crossed lovers.

An Amazonian hotel is the ultimate treehouse and provides stilt based accommodation.

The largest pool at its elevation sits on top of one of the most expensive resorts in the world.

This extremely narrow tenement boasts a maximum occupancy of just two.

This famous city eluded concrete detection until the early 2000's.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A battle between nature and architecture in the Cambodian jungle.

Abandoned city hidden from the world by tropical forest and isolation on the coast of Kenya.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

Modern-day cave dwellers carve elaborate homes out of volcanic debris.

Mysterious lost empire of the Silk Road.

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

An elaborate Mayan city shrouded in alien conspiracy revealed the tomb of Pacal the Great.

An isolated village literally built into the crevices and rock formations of a mountain.

A mecca for India's Jains.

This museum has a most unusual location: inside a giant, three-headed elephant.

This was once the center of the Birdman cult, and is now a World Heritage Site.

These Nubian pyramids are strange and unique, even by pyramid standards.

Temple of a million beers.