"The CN Tower opened in 1976 as the world's tallest free standing structure. At 553 metres (1,815 feet), it reaches more than a third of a mile into the clouds. The seven story sky pod features indoor and outdoor observation decks, a nightclub and a 400 seat revolving restaurant. The Space Deck, at 447 metres (1,465 feet), is the world's highest public observation gallery."

— from CN Tower at World Federation of Great Towers