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

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

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

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

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

A serene space tucked amid the skyscrapers of Hong Kong's bustling financial district.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

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

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

A nightmare for the claustrophobic lies hidden in Southeast Asia.

A Japanese concept restaurant that feels like a party thrown by the monsters in your closet.

The 10,000 Torii shrine.

A taste of the macabre Tokyo's ritzy shopping district.

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

The site of the deadly Triangle Shirtwaist Factory Fire.

Ride the subways of yesteryear.

New York City's only preserved family home from the 19th century.

Constructed in the 1920s, this former pencil factory is now an office building.

Where Greenpoint's first European settler—and troublemaker—made his home.

A reminder to choose water over wine since 1888.

Reverend Jen's unique museum/living room showcases her troll collection.

Behind a bodega is a small museum of relics and ephemera showcasing the history of New York.

A decommissioned military complex that's now a modern industrial park.