This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

An astonishingly accurate water clock that doubles as an hourly spectacle in this Berlin shopping area.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

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

Offal and flawless onion soup are on the menu at this restaurant that once catered to the workers of Les Halles.

A tribute to an explorer and naturalist often overlooked by history.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The bones of two medieval royal lions were discovered at the historic fortress.

Eighty million natural history specimens call this gargantuan museum home.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

Cozy basement bar sports an inventory of over 2,000 beers.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Cat art as far as the eye can see.

Museum preserving torture methods from the past.

Explore this medieval cathedral by trying to spot all the malevolent monsters hiding in its beautifully colored windows.

There has been an astronomical clock on this spot since the 14th century.

Visitors dating back to the 1600s carved their marks in the stones of the iconic tower.

This fascinating museum in an old water tower holds the world's largest collection of Vodou artifacts from western and central Africa.

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

Baroque celebration of the end of the Great Plague of Vienna.