A place to see how French aristocrats lived in the early 1900s.

This work of engineering is imbued with elegance and ingeniousness.

One of the world's steepest streets seems to have houses sliding down it.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

Known for the tunnel that leads visitors to the water.

A micronation on an islet along the coast of a Portuguese island.

A lush oasis full of vibrant plants and striking geometric displays.

Men in rubber-soled boots serve as your "brakes" on this toboggan ride Hemingway described as "exhilarating."

A tree that defies gravity grows in an ancient ruin.

A submerged archeological park still holds the wonders of a Roman Sodom.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

A remote candy-striped mountain in the Peruvian Andes straight out of the pages of Dr. Seuss.

A salty red wasteland in Tanzania is a breeding spot for endangered flamingos.

A fortified palace in the shape of a ship on the Thiou river.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

Site of the largest volcanic eruption in the last 25 million years, one which may have nearly wiped out humanity altogether.

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

Nearly 100 concrete graves lie hidden just beyond the pristine waters along the coast.

This Philippine island is dotted with (fake) Grecian ruins.

The ruins on a deserted tropical island in the Philippines bear the scars of WWII.

The once-grand remains of this resort are slowly turning into the strange ruins of the future.

It might not be as impossible to reach as its name would imply, but just about.

The world's most remote permanent settlement on an active volcano.