This once-forgotten oasis in the middle of Lisbon was first created over a century ago quite by accident.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

Week-long block party becomes a competition for the best decorated street.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

A beautiful but toxic fountain of mercury.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

Genoa's collection of over 4 million zoological, botanical, and geological specimens from around the world.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A Milanese café entirely designed by the American director Wes Anderson.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

This medieval fortification has weathered the centuries better than any other structure from its era.

A celebration of solstice followed by a fiery purging of evils.

A daily pyrotechnic celebration marks a beloved tradition during Valencia's festival season.

For one day every month Barcelona's Estació de França transforms into a market for model trains.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

An ornate tower shows off a local artist's architectural flair.

The Gaudí-inspired building that was the start of Terrassenc modernism.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.