Thousands of people will get a chance to climb the 17-hundred-and-76 steps of Toronto's CN Tower today and tomorrow.
Organizers hope the climb will help raise more than one million dollars for wildlife conservation.
This is WWF Canada's 27th and best-attended climb yet, with more than eight thousand people registered.
David Miller, a former Toronto mayor and current president of WWF Canada, will be climbing for the first time after training since January.