5,000 skulls in memorial to those killed by the Khmer Rouge.

A former French military respite turned jungle tourism hotspot.

A palace destined to never house a king.

An abandoned Cambodian resort that mirrored the downfall of the country as it was happening.

The oldest museum in Borneo is a cornucopia of rare taxidermy and human skulls.

The largest dinosaurs in the world, kissing above the highway.

Enormous statue of the Emperor of the Mongols.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

Enormous array of antennae fill a desert valley.

A market for witches is hidden within a train station.

Early habitat dioramas and home of the elusive gaff, the skvader.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

A beautiful but toxic fountain of mercury.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

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.

A giant scale model giving a sneak peek at what urban planners see for Shanghai by 2020.

This ratty natural history collection is a charming relic among a city rushing into modernity.

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

Peace Park and the Atomic Bomb Dome.

Museum dedicated to the largest battleship ever built.

A sprawling nature preserve harbors the world's only living dragons.

Hundreds of Buddhas in a re-discovered Indonesian temple.