This giant subway sculpture celebrates the fruit that inspired the theory of gravity.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Sweden's oldest animated sign is still lighting up the skyline today.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

Stockholm's deepest subway station is also a stunning ecological wonder.

This Stockholm light tower can be controlled by anyone with a smartphone.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

A science fiction-inspired apartment building designed by a famous Spanish architect.

An architect transformed this abandoned cement factory into his castle-like workshop.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

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

Old ships and machinery fill a historic harbor in the city that's home to Europe's largest port.

The 20-mile causeway that separates the Netherlands from the sea.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

Unsurprisingly, Holland is home to one of the most magnificent flower gardens in the world.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

Cold war icon and onetime "hole" in the iron curtain.

A fascinating insight into daily life in the Eastern Bloc.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A surreal museum of extraordinary industrial objects.

Architecturally stunning library serves as the hub of Finnish scholarly life and culture.

Fantastic stories on a miniature railroad.