Historic medieval fortified city in southwest France.

This futuristic observatory at the top of the Pyrénées offers unrivaled views.

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

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

Designed as a reminder of one of the darkest moments in Austrian history.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Macabre astrological automaton clock dating to the late 1400s.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

A series of playful yellow penguins share a serious message about the environment.

One of downtown Berlin's last reminders of its Communist past.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

A little sculpture with a large wardrobe.

Climb inside an iron crystal magnified 165 billion times its normal size.

Meet the bronze beloved pet to a family of famous peeing statues.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.