Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

The eclectic seaside sanctuary caters to a rather fowl crowd.

A memorial to the monk who set himself on fire to protest the persecution of Buddhists in Vietnam.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Brussels' favorite peeing boy has a sister.

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

A little sculpture with a large wardrobe.

This antique thermometer honors the creator of the first universal temperature scale.

These rare statues are one of the few remaining material witnesses to Old Prussian culture.

A huge wooden clock that is so beautiful its creator was forcibly blinded.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

A 20th-century picture show in 3-D.

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.