Bright yellow lounges and benches beckon passersby in a clever guerrilla urban seating installation in Hamburg, Germany by artist Oliver Show.

Stairs transform into pianos, painted stereos play sounds like magic and buildings are massive instruments when music and street art collide.

Brazilian artist Regina Silveira's black vinyl appliques turn ordinary rooms into bizarre spaces where gravity and perspective don't seem to apply.

A sparkling clean, blinding white living space is transformed into a chaotic canvas for thousands of children armed with stickers in Yayoi Kusama's art exhibit.

How do you get residents to keep their city clean - and keep smiles on their faces at the same time? These fun public games are a truly excellent solution.

Onlookers were fascinated and flummoxed when three human figures appeared in the New York City sky, zooming around buildings and bridges.

Pedestrians in a French town were surprised to find that one day, a playful new addition to their brick walkway suddenly appeared...seemingly out of nowhere.

The rings displaying a tree's age in a cross-section of its trunk are translated into somber piano music by a record player and music software.

Brooklyn-based artist Dan Witz shocks passersby with ultra-realistic painted images of people trapped behind grates in urban buildings.

The city of Lisbon, Portugal got creative in the face of budget issues this year with an annual Christmas light display that's as festive as ever.