Check out this cool Olympic Tower and Olympic Stadium's Observatory in Canada

The Olympic Stadium is a multi-purpose stadium in Canada, located in the Hochelaga-Maisonneuve district of Montreal, Quebec. Built in the mid-1970s as the main venue for the 1976 Summer Olympics, it is nicknamed "The Big O," a reference to both its name and to the doughnut-shape of the permanent component of the stadium's roof. "