A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

Artist Natividad Sánchez wrote a new ending for one of Roman mythology's tragic love stories.

This historic fountain is a favorite neighborhood meeting point.

Dedicated to a young woman who broke gender barriers at the University of Madrid.

This Art Nouveau gate still stands at the former entrance of a 20th-century Spanish writer's colony.

This sculpture of a rider on horseback once crowned the tomb of an Iberian aristocrat.

A bronze statue of the fictional character nicknamed "Mrs. Hat" from a beloved Belgian comedy.

An ode to the famous Las Vegas signage.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

Once used to calculate the various levels around the country.

The remains of a convent turned military barrack in the heart of Madrid.

In the middle of a Vienna square, Roman ruins dating back some 2,000 years are on display.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

A set of seven houses, each built in a style that represents a European country.

This 18th-century project to build the world's tallest gravity dam was never completed.

When this former hospital pharmacy closed in 2013 it already looked like a museum, so they turned it into one.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

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

This small museum nestled inside a souvenir shop is dedicated to Sweden's most well-known toy.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

Down this yellow brick road, visitors are treated to toadstool houses and massive mushroom sculptures.

A man throwing a giant severed hand towers over Antwerp’s main square.