The most isolated mailbox in America lets desert travelers record their passing.

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

Huge stone depressions which may have acted as an Incan agricultural experiment.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Menacing or in memoriam, the Silent People and their meaning are left to interpretation.

A fortified city, home to a remaining population of five families

The summer home of the largest colony of bats in the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

These millipedes glow not out of attraction, but as a not-too-subtle warning.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

Stunning wetlands ablaze with pink lotus flowers.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

This 80-year old mannequin is so lifelike it is believed to be an embalmed corpse.

An abandoned aircraft sits submerged in a lake in the Alaska wilderness.

A natural gas leak provides a flickering flame beneath a waterfall.

The central mosque of this Mali town is entirely built from mud.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

This strange geological landscape erupts with sudden bursts of water.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.