This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Eat the ultimate iteration of Portugal's most beloved pastry.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Every inch of this chapel is covered in craftsmanship from across the world.

Thousands of well-dressed mummies below a monastery.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Go inside to really appreciate this 500-year-old technological masterpiece.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Famously misunderstood wonder of the ancient world

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

The remains of the great moral philosopher reside in a university in London.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Eighty million natural history specimens call this gargantuan museum home.

Inaugurated three times, this tower offers some of the best views of Madrid.

An old, deep well, connected with a miraculous, divine rescue and the patron saint of Madrid.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

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

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

Commonly acknowledged as the only public monument to the Devil himself.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.