Catacombs turned marketplace.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

This astronomical clock is the second oldest in England.

Banksy's image of a naked man dangling from the window of a sex health clinic.

A quaint hamlet of nine cottages around a small green near Blaise castle.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

Constructed from recycled wrought iron railroad tracks, it's been described as the most beautiful seaside pier in England.

The oldest residential street in Europe also features an optical illusion.

More than a million titles fill the labyrinthine shelves of this prestigious private library.

With lush plants and flowers, huge trees, ponds, and hidden monuments, this place feels a bit like discovering Narnia.

Museum about life, death, and cannibalism in the Stone Age.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

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

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.

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

Amsterdam's former hotspot for public executions and dissections.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

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

This Kyoto Starbucks takes coffee drinkers back in time.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

A 20-meter (65-foot) robot towers over Tokyo Bay.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.