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Like the Ostankino Tower, CN Tower is a member of the Worth Federation of Great Towers. It is one of the tallest towers in the world. It is 553 metres high. CN Tower is situated in Toronto, Canada. CN means Canadian National. It's the name of the railway company which built the tower in 1976. A lot of tourists visit the Tower. They enjoy a bird's eye view of Toronto. The Tower is also famous for the " Glass Floor". Brave tourists can admire the city from under their feet. CN Tower is open every day except December, 25th. The Tower is worth visiting!