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.

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

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

Come stay at a live-in art installation.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The first transatlantic wireless signal was received at this 17th-century fort.

This historic lighthouse has been reincarnated as the perfect picnic place.

A World War II gun battery sits at the easternmost point of North America.

Longest canal tunnel in the world, abandoned in the 1960s.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

This oddly named town refuses to change its phallic moniker.

Ancient snack bar of the Roman Empire re-opened.

Massive puppet-automaton machines created by French artist collective Machines de l’Ile.

The first green space constructed on an elevated viaduct.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A restaurant and observation deck built in a unique broadcasting antenna.

"Girl in a Wetsuit" is what happens when a sculptor has to find a way around a 100 year old copyright.

Five candy-colored villages on the Italian Riviera.

The final resting place of the poets Shelley and Keats.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.