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

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

Possibly the oldest church in Barcelona, this basilica has its pagan and Christian mythologies all mixed up.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Holy Grotto of Montserrat Monastery holds one of Europe's mysterious black Madonnas.

This much reformed Modernist building will be of interest to fans of contemporary architecture too.

Remains of the walls of the Roman city named for its founder

This amazing cathedral was built on the site of the first Marian shrine in Spain and is important to Spanish speakers the world over

The Museum of the Forum of Caesar Augusta showcases the city's ancient Roman sewage system.

This huge abandoned fortress hidden inside a mountain holds a world of subterranean secrets.

The forest hides a cemetery where members of the British Legion rest in peace.

This mine is home to the largest man-made hole in Europe.

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

Incredible labyrinth of man made caves.

This historical Netherlands fortress still bears the marks of its single siege.

This cannonball has been lodged in the church wall since a 1695 bombardment destroyed the city center.

A little sculpture with a large wardrobe.

Belgium’s famous peeing statue has worn many hats (and coats, and pants), which are on display at this small museum.

Christ's blood allegedly preserved in a Belgian town.

A beer pipeline runs beneath Bruges.

This is a surprising Art Deco district in a city with a history dating back to the 17th and 18th centuries.

A whimsical bridge uses saxophones to pay tribute to two great men and the European Union.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.