CN Tower. Toronto
This is the CN Tower. From 1976 to 2007, this tower was the tallest structure in the world. It is still popular â€” every year it attracts more than 2 million people. The bravest can take part in the attraction Â«Edge WalkÂ». It is a walk around the open and unenclosed circumference of the viewing platformâ€™s roof at a height of 365 meters. This metal roof is one and a half meters wide.