For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Legends surround an ancient tree trunk riddled with nails for good luck.

A silly medieval mural preserved on the side of a Viennese house.

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

This piece of early engineering is rather unknown despite its location in the heart of Madrid.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

A scene from one of Hungary's most famous novels.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

The oldest private art gallery in all of Hungary.

Late at night, the bust of the "Dracula" actor was snuck onto the facade of this Budapest castle.

A spherical "micro-nation" in the heart of Vienna.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Dr. Fleming's work saved the lives of many bullfighters thanks to his discovery of penicillin.

The famous sculptor had a hand in this imposing fortress.

An ancient Roman snake god, carved expertly into stone.