This eccentric cave dwelling is bizarre even by the standards of a subterranean town.

Clusters of huge boulders in the Australian Outback.

This tiny lake temple dedicated to a water goddess seems to float on the surface.

Exotic, erotic, and esoteric, one artist's live-in Bali gallery brings a splash of color and madness to its surroundings.

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.

An extraordinary "City of Caves" carved from solid stone.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

Step back in time and witness the fall of Constantinople.

This museum was invented in a novel before being made real by the author.

A marvel of Byzantine engineering under the streets of Istanbul.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

One man's desire to transcend art led to the construction of this outsider chapel.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Natural cathedral designed by Italian artist Giuliano Mauri.

Hidden in an Italian forest is a completely homemade amusement park that has taken a lifetime to create.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.