The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An underground city of salt.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

Abandoned waterpark turned counter-culture mecca.

This abandoned Slovenian military barracks has become a punky-political art squat.

Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Go surfing on this urban wave, "hacked" by local surfers.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Copenhagen's celebrated theme park and gardens.

A former imperial sea-fortress and Soviet prison.

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

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

"There's nothing there," and other lies the KGB told us.

An abstract monument to a symphonic composer.

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