Stockholm's narrowest alley is barely over two feet wide.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

This glacier interpretation center houses the world’s only bar made completely from glacial ice.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

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

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Two cannon-like cranes were installed on top of the bank building to fend off bad feng shui.

Situated on a sacred Inca site, this 16th-century cathedral took nearly 100 years to build.

A Christian monastery stands on what was once a holy Incan temple.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

A lush indoor jungle fills this bustling Madrid transportation hub.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

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

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

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

The beautiful baroque library of the Hapsburg empire.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

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

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

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

Once the home of a hermetic monk, this cave now houses a small church.

Museum dedicated to the terror regimes of Hungary.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.