An collection of Chinese propaganda posters from 1949 to 1979.

This supermarket in Shanghai appears to be a typical Chinese convenience store, but all of the bottles are empty and all the containers are filled with nothing but air.

Lifelike statue of the Chinese philosopher in the bathtub.

A modern-day Lascaux cave underneath Paris.

The former global standard for the exact mass of one kilogram sits under lock and key outside Paris.

This abandoned fort is said to be the most haunted place in India, so much so that entry is prohibited after sunset.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

A blooming house of worship for the masses.

An ancient iron pillar in Delhi that seems to be rustproof.

These crumbling towers are some of the last remnants of a centuries-old Vietnamese culture.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

The small candy-colored ride is the last rooftop Ferris wheel in Tokyo.

A 32-acre fun park dedicated to all things cheese.

Deco Modern sculptures of the people of the Pacific, cast for the 1939 Golden Gate International Exposition.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A century and a half of research in the sciences and natural history, still going strong.

The rustic cabin-like decor of this Arts and Crafts-style church reflects the love of nature central to its little-known theology.

Floating man-made island and upscale restaurant.

Art from the latest counter-culture; kids who dye their hair blue and believe the future will be a post-apocalyptic water world.

San Francisco's oldest operating hotel, with a Victorian atmosphere and a "haunted" fourth floor.

A mysterious painting of the self-declared Emperor of the United States watches over a local hof-brau.

A walk down memory lane in the heart of one of San Francisco's most notorious neighborhoods.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.