Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

Apartment complexes built into huge repurposed natural gas tanks.

A relic of World War I that now exist as a piece of public art.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

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

A diminutive statue that was inspired by the sculptor's own daughter.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

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

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

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

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

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

Increasingly decayed figures stand as a powerful reminder of the human costs of Czech Communism.

This spooky statue sits outside a famous Prague theater.

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

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

Golden cobblestones remember a time when this small alley was used to avoid having to give a Nazi salute.

In the middle of a Brussels roundabout, a cargo container balancing on its edge.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

A little sculpture with a large wardrobe.

Meet the bronze beloved pet to a family of famous peeing statues.

With its webbed walls and bright red coloring, Calgary's iconic bridge looks like a finger trap puzzle stretched across the river.