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

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

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

A condensed piece of China floating in a Dutch harbor.

A massive stone fox oversees a Rotterdam elementary school crosswalk.

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

A statue of the second-tallest Dutchman in history.

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

Amsterdam's Red Light District leaves little to the imagination.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

The attic of a four-century-old canal house hides a clandestine church.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

A fountain standing as a testament to a doomed alliance.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.