Mo to Th from 09:00 AM to 10:00 PM,Fr to Sa from 09:00 AM to 10:30 PM,Su from 09:00 AM to 10:00 PMAt 553.3 meters, this is one of the world's tallest buildings. Since its spectacular opening in 1976, the CN Tower has hosted close to two million visitors a year. One of the most exciting ways to see the world is from the exterior glass-floored observation deck, located 342 meters (1122 feet) above the ground. Or you can go up to the Space Deck at 447 meters (1467 feet), the world's tallest observation deck with a 160-kilometer (99-mile) view. The revolving 360 Restaurant and Horizons Bar complete the dizzying picture. Entry fees and timings vary according to which of the CN Tower's attractions you wish to enjoy.