The first green space constructed on an elevated viaduct.

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

A surrealist timepiece by the artist of melting clocks.

France's national museum of scientific and industrial instruments.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

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

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

The oldest stone house in Paris was built by its most famous alchemist.

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

Notorious artist squat renovated into legal studios.

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

Climb to the top of its spiral spire for spectacular views of Copenhagen.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

This often-overlooked ocean walkway was once considered an impossible fantasy.

Along a coast that sees the annual migration of humpback whales, a geological formation that takes the shape of a whale’s tail.

A peculiar clock commemorates a historic victory won by ringing the noonday bell an hour early.

This strange statue depicts a young boy's body with an adult Mozart's head and a single wing.

A memorial for public executions that dates back to the 14th century.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.

Too much gossip or just missing curfew could land you in here for a couple of days.