A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Fall down the rabbit hole into a surreal journey of human consciousness "from ass to soul."

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An on-site urban farm and fish pond supply some of the produce for this upscale restaurant.

This museum contains a vast array of puppets and marionettes from all over the world, featuring incredible works by Portuguese creators.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

This Czech church doubles as something of a permanent fashion exhibition for a statue of the Infant Jesus.

The palace window through which Protestant nobles flung two Catholic regents, thus sparking the Thirty Years' War.

This doorless 20th-century elevator doesn't stop or slow down.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

The world’s first statue of the late Apple co-founder.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

The metal leaves on this tree are engraved with the names of Holocaust victims.

This building has survived for more than a century and remains virtually untouched.

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.

The slender brass strip in Prague's Old Town Square was used to tell time from 1652 to 1918.

An existential riddle in the world's largest ancient castle.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.