A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The largest medical and anatomical collection in France lies hidden from the public.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

Pitié-Salpêtrière was the dumping grounds for women who received the dreaded diagnosis of "hysterical."

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

France's national museum of scientific and industrial instruments.

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.

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

A slice of central Asia in the middle of Berlin.

Started as a kitchen garden, now the second largest botanical garden in the world.

A reconstructed farm shows what life was like in Norway 1,500 years ago.

In the northernmost city in the world, it's illegal to be buried because it’s too cold for bodies to decompose.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

The convergence of two currents makes this a surprisingly pleasant getaway in the Arctic Circle.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Walk 2,300 feet above the ground on the "Troll's Tongue."

Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

This small chapel is built of human bones and decorated with a golden skeleton.

This eatery transports diners to a place that no longer exists: East Germany.

Furniture tries to escape an abandoned building in San Francisco.

Standing in for the first ship to navigate the Northwest Passage.