Architects in Sydney, Australia have found a way to light up a part of the city that was once perpetually dark, hidden from the sun by tall buildings. They've done it by capturing the sunshine, and bouncing it between buildings with an architectural device called a heliostat. Lester Ranby reports.
Quite possibly the coolest traffic stop anywhere on earth. While waiting to cross the street in this Germany city, you can actually play pong against someone waiting on the other side of the road!