A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

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

A rooftop restaurant hides in plain sight atop Vienna's Palace of Justice.

One of the world's largest collections of rare medical texts and ephemera.

Extremely long cable tunnel buried under the river.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

An automaton perched above an classic clock and watch store

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

A statue commemorating a beloved stray dog who was adopted by the entire neighborhood where he lived.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

Along the pavement of this neighborhood in Madrid are quotes from famous authors.

The neighborhood surrounding the memorial was the epicenter of the AIDS epidemic in Louisiana.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

The colonial city's social history is reflected in its fanciful door knockers.

A cozy bookstore and coffee shop in the heart of Cartagena's Old City.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Thirteen pastel palaces in downtown Charleston add a gorgeous splash of color to the city.

Paths are maintained, but trees have taken over plots.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

The best way to get a sneak peek at the movies.

Home to more than 13,000 pieces of war memorabilia and military equipment.

Secret North Korean passage discovered below the world's most dangerous border.

The best place for scenic views of the DMZ and North Korea.