Confronting Withering Heights in Toronto, Canada
Standing 1,815 feet tall, the CN Tower keeps good company with the Empire State Building, Chunnel, and Panama Canal—at least according to the American Society of Civil Engineers and their seven wonders of the modern world. Visitors to the glass floor can test their backbone by daring to stand on the transparent floor and gazing 112 stories down. Although it’s five times stronger than the necessary weight-bearing standard, it takes nerve to face such a vertiginous view. With only clear tempered glass beneath your feet, even the bravest of daredevils may just feel their knees buckle.