Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

Each of these hand-painted wooden boxes, which date to between the 16th and 19th centuries, contains a genuine human skull.

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

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

This collection of French root art looks like an indoor fairy wonderland.

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.

Dedicated to the history and culture of smoking, this small museum now includes a vape lounge.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A unique museum tells the story of the day-to-day life of World War I soldiers.

An astounding collection of taxidermy, fossils, skeletons, and even a few strange live beasts.

Abandoned railway line circling the city of Paris.

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

This massive library holds what was once the largest book collection in the world.

Walk through Czech history in Prague's largest graveyard.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

This artificial cave looks like something out of a fairytale.

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

A renovated hotel is bringing new life to a nearly-abandoned mining town in Colorado.

An Orwellian sculpture with eyeball cameras watches passersby.

An old asylum graveyard that's been abandoned for half a century attracts those seeking a dark thrill.

A Jenga-style cylindrical tower of books that appears to go on forever.