Snap-Shot-City is an “urban photographic treasure hunt” that encourages folks to pick up their cameras, head out into their cities, and see things in a whole new light. After 2,000 participants, who've taken 6,000 pics in 78 cities around the world, they know a thing or two about how to get people's artistic juices flowing

Now Snap-Shot-City is back for it's third year, and to kick things up a notch they're starting a good ol' urban throw down. Posing the photographic challenge to two of the world's cultural powerhouses — New York City and London the aim is to start a trans-Atlantic photo battle that will bring people together while also showing each city's unique urban landscape.

Get registered (if you're seriously hardcore, trying entering the team category) and on the big day you'll be given a list of top-secret interpretive categories. Then, hit the streets to complete the hunt. The challenge is also linking together two of the world's biggest gaming festivals — NYC's Come Out & Play on June 6-8 and London's Hide & Seek on June 26-28.