This Parisian gem is one of the most incredible ethnographic museums in the world.

The industrial architecture honors the laborers who brought the Exposition Universelle of 1900 to life.

What looks like a normal building is really a hollow facade hiding a subway vent.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The celebrated eyesore created by starry-eyed sweethearts.

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

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

Ancient ruins hidden underneath a modern luxury hotel.

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

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Once the grandest synagogue in medieval Spain, it now stands as a memorial of the 15th-century Jewish exile.

The remains of the second-oldest zoo in Europe can be seen within these library gardens.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

This sweet-toothed bear searching for snacks has been a symbol of Madrid for decades.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

One of corporate America's best-kept secrets is also one of the most publicly displayed.