First Floor

The CN Tower was built by the Canadian National Railways and was completed in 1975; 40 months after the construction had started. The Tower was built in order to improve television reception in the Greater Toronto Area.

The CN Tower is able to stand its full 1,815 feet in height because of a building technique that was used. A special mixture of concrete was poured into a mould (called a slip form) which was attached to the base. When the concrete hardened, hydraulic jacks moved the slip form higher. By doing this, 20 feet of the CN Tower was completed per day.

The Skypod level is made of concrete, mounted on a dozen steel and wood brackets, which were lifted by 45 hydraulic jacks. To put the 335-foot transmission mast into place a helicopter was used to airlift and place it on top of the tower. In fact the tower is so strong that 120-mile winds could not wobble the Skypod level.

The CN Tower is the tallest free standing structure in the world to date containing 2 observation decks, a night club and the world's highest restaurant, which can be found on the Skypod level, 1,100 feet in the air. Instead of taking the numerous amount of stair to get to the Skypod level, there are sensor sensitive glass elevators that travel 20 feet per second and is able to adjust its speed according to the wind level. To get to the Space Deck, just hop into the glass elevator again for a 40-second ride from the Skypod.

The Space Deck acts a lightening conductor, directing electricity into the ground. On top of the Tower are 270 panes of fiberglass that protect the antenna from ice buildup. The CN Tower is one degree away from being perfectly vertical.

To learn more: http://www.cntower.ca/frame.html