This massive library holds what was once the largest book collection in the world.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

An ancient city exhumed from the depths of the ocean.

An endless sea of white conical domes.

This picturesque mansion has gone from opulent ruin to nature museum.

An explosion of natural color known as "the river that ran away from paradise."

Unparalleled stargazing, one of Colombia's best observatories, and a swimming pool can all be found in the middle of this ancient tropical forest.

Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

This enchanting rainforest hotel looks as though it grew from the forest itself.

A beautiful deserted greenhouse in the middle of a park.

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

A battle between nature and architecture in the Cambodian jungle.

A former French military respite turned jungle tourism hotspot.