Urban exploration

They explore cities with their cameras and they are a growing tribe. Zhang Zefeng reports.

Dressed in a dark blue waterproof hooded jacket, sporting sleek outdoor shoes and carrying a light backpack, 33-year-old architect Zhang Yu has a hobby that involves the city's skyscrapers and bridges.

On a recent sunny weekend, Zhang along with other thrill-seekers, drove to a spacious museum on the outskirts of Beijing where age-old aircraft are kept. They crawled into the airplanes and then pulled out cameras capturing unique views.