This ancient Irish tower could easily have stood in for Rapunzel's prison.

The ruins of a medieval monastery named after a type of tree.

England's most notorious suicide spot.

An enormous and lavish Gothic church in Czechia.

This cemetery features modernist statues as strange as its name.

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

18th century anatomical amphitheater of the Royal College of Surgery of Barcelona.

Turntable anonymously received orphans, alms, and groceries.

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

Mountain where Jesus was first tempted by the Devil.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A student driver's nightmare.

Old Danish castle immortalized in Shakespeare's Hamlet.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

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

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

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

Copenhagen's celebrated theme park and gardens.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.