Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

A wonderfully strange collection of 500+ stuffed frogs doing people things.

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

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

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

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

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 Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

A mocking tribute to the past and modern leadership of Prague.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

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

Macabre astrological automaton clock dating to the late 1400s.

A Jenga-style cylindrical tower of books that appears to go on forever.