Abandoned railway line circling the city of Paris.

Remains of Roman amphitheater hidden in a sleepy quarter of Paris.

Ghosts of France's colonial past.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Climb to the top of the world's largest seated bronze Buddha.

While most books are made of wood, these wooden books are truly made of, and all about wood.

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

These jagged limestone blades cut out through the canopy of the jungles of Borneo.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A haunting collection of the vanished and disappearing natural world.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

As the aging humans of this Japanese village die off one local artisan is replacing them with eerie homonculi.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

Remote, volcanic island that Darwin, Hooker, and the Royal Navy shaped into a thriving, artificial ecosystem.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

Watch the newest land on the planet form before your eyes.

A true treehouse near Hawai'i Volcanoes National Park.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.

This black shoreline is made up of exploded lava particles.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.