The inverted exclamation point of Toronto’s skyline is the CN Tower. The cloud-piercing concrete structure reaches a height of 1,815 feet (including the antenna). That is equivalent to a 147 story building. This was the world’s tallest tower from 1976 until 2009 and still holds the title in the Western Hemisphere. No wonder the American Society of Civil Engineers declared it one of the engineering Seven Wonders of the World. The practical purpose of the tower is radio and television broadcasting. The purpose for tourists is eye-widening fun. There are three observation platforms at 1,122, 1,135 and 1,465 feet. You can also eat at a café or revolving restaurant. If you really want to get your heart pumping, dare to experience the EdgeWalk. Your knees will shake while walking outside on a five-foot ledge at 1,168 feet. This half hour may seem the longest and most thrilling of your life.