A part of the world's largest marsh seems to be growing bright red Martian grass.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

An abandoned town of skeletal wooden homes.

Stunning examples of Russia's 18th-century wooden architecture.

A lush desert oasis in the shape of a narrow crescent.

The world's largest natural arch was forgotten for over 50 years after its discovery.

The Uyghur settlement in the middle of a lake continues to raise questions.

Extremely isolated Silk Road caravanserai in the middle of nowhere.

Avenue of trees planted by cosmonauts before their space departures.

Submerged trees jut ghost-like out of an idyllic turquoise mountain lake.

Glacial lake that mysteriously empties itself every year.

A centuries-old fortress city lies in ruin.

An eclectic mix of influences rot together in harmony in this India necropolis.

Centuries-old bridges grown from tangled roots.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

Ha Long Bay's "Cave of Surprises" houses a popular phallic rock formation.

A canvas of crops grow from vibrant red soil in this terraced farmland.

A complex and beautiful system of rice terraces covers a million acres over the mountains.

270 million year-old forest of stone.

This quiet area of Yunnan Province annually transforms into an unbelievable sea of yellow flowers.

A natural arch offers panoramic views of Yangshuo's karst hills.

Intensely colorful calcite pools in Southern China.