Some people like to live life on the edge -- literally.
Modern, lightweight camera equipment and a heightened (sometimes illegal) sense of adventure has made urban exploring an experience that most people wouldn't even dream of.
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The trend, called Rooftopping, has thousands of photographers climbing to the top of the world's tallest skyscrapers for an unrestricted, bird's-eye view of the street below.
Cue the acrophobia.
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