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

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

A brutalist gem towering over the heart of Milan.

A larger-than-life house of cards stands outside the house of a former fashion designer.

This camera store in Milan holds one of Europe’s largest collections of luxury-antique cameras.

This small Milan street is filled with colorful homes and a rich history.

Da Vinci's equestrian statue, 500 years in the making.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

The secret medieval communication system will whisk your words above the noise of the crowd.

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

A long-closed church turned into a saintly skate park.

A bridge that has seen many reiterations over its lifetime.

A strangely curved lamppost stands tall over this avenue in Rotterdam.

An enormous Polaroid picture adds an artistic flair to Rotterdam.

Mosaics created from 11 million cigar bands.

This colorfully-painted tunnel links two distinct parts of a historic neighborhood.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

Pull up and have a drink at a museum filled with hundreds of years worth of shipwreck artifacts.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

A grassy pyramid named after a French battle.

A dream-like maze full of strange art, surreal spaces, and fantasy landscapes to get lost in.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.