What lurks in the murky waters of a man-made lake in Surrey? A fantastic glass-roofed billiards room accessible only through a series of secret entrances.

So you've always wanted to participate in an internet meme but you're just too lazy? The Lying Down Game is the perfect answer: it's Parkour for lazy people.

Is the "new sport" of pomparkour for real? The video showing insane jumps with ladders is an ad for an energy drink, but shows some interesting feats.

Parkour is an extremely challenging urban sport that involves big jumps, impressive acrobatics, and a lot of guts. This group captured all that in a crazy jump.

Black Friday . . . are you preparing to battle the holiday shopping crowds? Brush up on your ninjas skills before you go into the battle of the urban ninjas.

Performance art at its best is when the performers, their environment and the audience all interact. This amazing urban dance project accomplishes that and more.

In today's sex-saturated society, advertisements promoting condoms, HIV awareness and safe sex have become mainstream.

From houses and estates to factories, mines, military buildings and prisons here are the explorations of twenty buildings by one daring European urban explorer.

These articles cover abandoned buildings, vehicles, towns and cities from around the world - highly organized, summarized and collected for the very first time.

Variety in color can be amazing, but pushing a single color can be even more. Here are some eyeopening monochromatic shots in red, blue, green, purple, orange, and yellow.