This 400-year-old tree is actually an immigrant from North America.

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

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

A surrealist timepiece by the artist of melting clocks.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

Notorious artist squat renovated into legal studios.

The video game-themed street art first popped up in the French city.

An opulent monument built for a duke who donated his entire fortune to the city of Geneva.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

On the side of a building, a depiction of the woman who became a local legend by tossing soup out her window.

One of the longest wooden benches in the world snakes around Geneva's Treille Promenade.

A statue of the Swiss cartoon character stands outside the school that inspired his creator.

Why a column on the entrance is inscribed with a verse from the Quran is one of Sicily's many mysteries.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

The world's most active stratovolcano is almost always erupting.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

This medieval city gate is now a blend of the past and the modern world.

This Italian ski resort rose to fame when Benito Mussolini was held prisoner there and then rescued by the SS.

What looks like a link in Gondor's early warning system is actually a centuries-old Italian fortress.

The yawning maw of this pagan visage is said to bite off the hands of liars.