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

The remains of what was, not so long ago, the world's largest city.

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.

Rock-cut cave complex filled with ancient Buddhist artwork.

Made by a man on a worldwide sanitation crusade.

Liquor and flowers mark a holy site for Indian motorcycle riders.

Countless grotesque faces stare out from this eerie Prague art wall.

The smallest country in Australia is a principled little thing with a friendly emperor.

Dilapidated ruins that once treated a notorious young serial killer, currently hosting vandals, squatters, and ghost hunters.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

An indigenous take on European design creates a stunning visual overload.

A church dedicated to the Mexican skeleton saint.

This church devoted to Mexico's "dead saint" is a festive celebration of a formerly hidden religious figure.

Panorama exhibition hall in old silent theater with a beautiful backyard garden.

Medical and zoological curiosities for sale.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

Gift shop offering toe tags and chalk body beach towels tucked into a coroner's office.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

Once a purveyor of Santeria supplies, religious products , and household sundries, now closed.

This hands-on math museum believes in turning concepts into constructs.

A shrine to a skeleton saint in the city of angels.

A rotting tree in the middle of Seattle doubles as an elaborately-controlled art piece.

Isolated atop this Balinese sea crag is a lovely Hindu temple that is said to be guarded by sea snakes.

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