Giant marble phalluses on the sacred island of antiquity.

The hallucinogenic center of the ancient world.

China’s breathtaking futuristic library is lined floor to ceiling with fake books.

Rock-cut caves and 7,000 Buddhist sculptures carved into the nearly sheer face of a sandstone mountain.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A fifth-century temple improbably built into the side of a cliff.

This rare volcano spews the strangest and (literally) coolest lava in the world.

The tallest residential building in Africa is an unsettling Brutalist monolith.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

The turquoise-studded skull of a long-dead Aztec man sits within Mexico City’s Museum of Anthropology.

A museum in the former home of Marxist revolutionary Leon Trotsky.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Meant to be one of the most extravagant hotels in the world, now an eerie, abandoned architectural gem in Mexico City.

66,000 pieces of art, donated by one of the world's richest men.

The buildings are among the few Frank Lloyd Wright structures still standing in Japan.

Turn around and stick your head between your legs for the best view of this tree-covered sandbar.

"Singing sands" and the world's largest hourglass reside near Japan's Kotogahama beach.

This exacting restaurant will charge a fine for every grain of rice you've left behind.

The traditional houses along the coast of this charming Japanese fishing village allow people to sleep above the sea.

This high-design church is made up of two dizzying spirals meant to evoke the weaving together of marriage.

A sculpture that resurrected the only tree standing following the devastating 2011 tsunami.

A plaque marks the site directly below the mid-air detonation of the atomic bomb over Hiroshima.

Hanging over one of Japan's "hidden valleys," these vine bridges must be remade every three years.