Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A pair of connected skyscrapers form this symbolic gateway.

This historic timepiece is thought to be the only public clock in the world that keeps lunar time.

Inat Kuća, or "House of Spite," is more than just an oddly named restaurant.

Oriental bazaar in the heart of Sarajevo.

The haunting ruins of a military fortress turned astronomical observatory sit on a Sarajevo mountaintop.

A war-torn Olympic relic is being overtaken by graffiti and nature.

This hidden art nouveau gem was designed by an architect in search of a national style.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

A church of bones, decorated with 40,000 human skeletons.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

This endearingly discomfited urinating statue commemorates the sneaky pees had by us all.

An alien church provides much needed silence in the midst of a Finland shopping center.

A subterranean house of worship carved right out of the bedrock.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

This dizzying tower was built to better broadcast the 1980 Moscow Olympics.

This medieval Estonian tower provides access to a series of tunnels that have been home to soldiers, punks, and fine art.

This old Estonian mine has been kept like a sprawling time capsule of the local shale industry.