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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

The Adriatic's most famous wind can be reliably experienced in the city's Marina.

This Roman monument is surrounded by more recent construction, offering a stark contrast between ancient architecture and the modern urban landscape.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

A relic from the Industrial Revolution got a second life as a contemporary performing arts space.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

This one-time health resort was used by aristocrats around the world.

Two planes stand abandoned after the closure of an aircraft-themed restaurant.

A haunting collection of sunken wooden barges litters this Italian river bend.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

A modern sliver of architecture in Roma.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

This Renaissance palace features a unique architectural design and is now home to the Ferrara National Art Gallery.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

A map of Italy made entirely of trees.

The only museum with its curator—and her pets—buried inside.

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

The mark of the Devil's horns on a marble column in Milan.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

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

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.