On 30-year quest, man seeks home for photos

Gao Yuan has taken nearly 700,000 pictures of tourists in Tian'anmen Square since he first began plying his trade in 1979 at the age of 19.

Over the decades, he has witnessed many changes, from the popularization of color photography to the introduction of digital cameras and the subsequent decline of photographic film.

If each of the pictures he has taken since he began were laid out side-by-side on the ground, they could circle the square's perimeter 40 times.