If you've ever wondered what it's like to climb to the top of the Brooklyn Bridge at night, explore the sewers of Las Vegas, infiltrate a privately owned 80-story building in Chicago, or sprint through New York's subway, this video gives you a pretty comprehensive taster.

Made by SilentUK, this film, called Crack The Surface, takes a look at a small collection of urban explorers in the US who treat the city as a giant playground. As a bonus, it's also nicely produced. Filmed across New York, Indianapolis, Chicago, Las Vegas, Minneapolis and Montreal, it gives a great insight into what motivates these guys to do what they do, as well as relaying some fairly terrifying incidents along the way. Also, lighting fireworks in a small, enclosed, underground space is both stupid and amazing. [SilentUK]