A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

This Parisian gem is one of the most incredible ethnographic museums in the world.

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

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

This museum houses an imposing skeleton army comprised of creatures great and small.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Ancient artists in the middle of nowhere.

Hitch a boat ride to dine on stilts while watching wildlife.

Road signs in Namibia mark the location of one of the five major circles of latitude.

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

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

A sobering account of the vibrant multicultural neighborhood that was destroyed under apartheid.

A memorial to the only dog ever officially enlisted in the Royal Navy.

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

The world's largest reflecting pool is just two centimeters deep.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

Home to some of the oldest hominid fossils ever found.