Seven Wonders of the Modern World 3. The CN Tower. Toronto Canada The CN Tower is the tallest freestanding, man-made structure in the world, at just over 1815 feet. It is also among the most frequently visited tourist attractions in all of Canada. Visitors can test their nerve by standing on a glass floor more than 1000 feet above the ground, eat at the Restaurant while enjoying the best of Toronto imaginable, see movies, and much moreSeven Wonders of the Modern World 3. The CN Tower, Toronto, Canada The CN Tower is the tallest freestanding, man-made structure in the world, at just over 1815 feet. It is also among the most frequently visited tourist attractions in all of Canada. Visitors can test their nerve by standing on a glass floor more than 1000 feet above the ground, eat at the 360 Restaurant while enjoying the best view of Toronto imaginable, see movies, and much more