The icon CN tower of Toronto was the largest standing structure when it finished construction in 1976. The tower functions as an observation and communications tower in Downtown Toronto, Ontario. It also has a great restaurant at the top called the 360 restaurant. The food there is amazing. They also do this thing there called the Edge Walk. Where if you want you get strapped into a harness and attached to this rail at the top of the tower with just enough slack to hang over the edge.