The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

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

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

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

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

German-style coffee and cake, just like Oma used to make it.

The footprint of a frustrated devil in Munich's Cathedral.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A stairway to heaven, or to nowhere at all.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

A floating cat sanctuary on an Amsterdam canal.

The world's only museum devoted to the wonders of fluorescence.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

Architectureal fantasy quarter of Rome.

Inside this building is another country within Rome, a sovereign entity without a physical territory.

Drink wine handed out through a window as part of an age-old tradition.

Architectural monsters are devouring this palace's every door and window.

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

This magical-looking island is notorious for the misfortunes suffered by its owners.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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