A fountain standing as a testament to a doomed alliance.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Roman ruins top white travertine terraces formed by ancient hot springs.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

Located inside Hoge Veluwe National Park, this museum began as the private collection of a prominent female art collector.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Made of 41,900 pieces of mosaic, it took two years to piece together this giant egg.

A modern reimagining of a medieval city gate.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

Amsterdam's former hotspot for public executions and dissections.

This small town in the Netherlands has no roads but instead, miles of canals and over 100 bridges.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

A grassy pyramid named after a French battle.

Take a stroll through the hellish grotesques of Hieronymus Bosch in this elaborate Netherlands church.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

This enormous censer uses a pulley system installed over 400 years ago.

Thanks to an acoustic anomaly, this unassuming stone bench has heard one hundred years of secrets.

Seaside ruins of a settlement that date back to the first century B.C.

Dedicated to one of the author's most iconic works.

Remarkably intact Roman stone fortifications have encircled this Spanish city for centuries.

A hidden three-foot-wide house separates these two regal churches.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.