This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Every winter, this former planetarium is transformed into a massive, brightly-lit Christmas ornament.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Europe's official "zero-level," the equator of elevation.

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

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

Building Men of War and Indiamen from Holland's Golden Age.

This giant wire frame man sculpture is crouched in contemplation.

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

A farm turned upside down.

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

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This home designed for chocolate magnate Antoni Amatller is an exquisite treasure-box of Catalan Modernism.

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.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.