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.

A centuries-old bar once frequented by Picasso, Hemingway, and Dalí.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

An open-air "garden" of mural art that changes weekly.

Botero's plump bronze horse presiding over Barcelona's airport terminal

Built on the foundations of an ancient Roman villa, the unique architecture of this castle on the Catalan coast was used as a set for 'Game of Thrones.'

Behind this unmarked facade lies the original bomba—a crunchy orb of fried mashed potatoes stuffed with minced meat.

The much-loved protagonist of famed Argentinian comics can be found sitting on a park bench.

The atmospheric ruins of a historic church can be found on a hill above the city of Oviedo.

Religious dwelling in a Spanish volcano.

Meant to resemble a massive tree, the building is the best example of Spanish organicist architecture in Madrid.

Earth's rocky history has rarely glittered so brightly as it does in this Spanish museum.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

An underground city of salt.

One hundred years ago this small house in downtown Zürich became the birthplace of the Dada movement.