© James Carpenter/WWF-Canada
Mid-spring in Toronto is the time for the CN Tower Climb challenge, when thousands ascend the top of this iconic monument. The goal is 144 flights, which consist of 1,776 steps. The fee participants have to pay is spent on solving environmental problems, so by completing this challenge you'll exercise your muscles, get an opportunity to see one of world's widest urban panoramas, and at the same time help our planet.
