CN Tower - Canada

• CN Tower was completed in 1976, becoming the world's tallest free-standing structure and world's tallest tower at the time.
• CN Tower was built by the Canadian National Railway.
• It was Opened to the public on June 26, 1976 but Official opening held on October 1, 1976.
• It held both records for 34 years until the completion of Burj Khalifa and Canton Tower in 2010.
• In CN Tower name "CN" originally referred to Canadian National, the railway company that built the tower.
• In 1995, the CN Tower was declared one of the modern Seven Wonders of the World by the American Society of Civil Engineers. 
• CN Tower weighs 130,000 tons which is 35x the weight of the Eiffel Tower.
• It took 1537 workers 40 months to complete the tower.
• CN Tower has the world's highest restaurant and the world's longest metal staircase.
• The construction costs of CN Tower was approximately CDN$63 million.
• When the CN Tower opened in 1976, there were three public observation points: the SkyPod that stands at 447 m, the Indoor Observation Level (now named Indoor Lookout Level) at 346 m , and the Outdoor Observation Terrace (at the same level as the Glass Floor) at 342 m .
• The CN Tower was once lit at night with incandescent lights, but they were removed in 1997, because they were inefficient and expensive to repair
• In 2007, light-emitting diode (LED) lights replaced the incandescent lights that lit the CN Tower at night, the reason cited that LED lights are more cost and energy efficient than the incandescent lights. 






• On September 12, 2007, Burj Khalifa, then under construction, surpassed the CN Tower as the world's tallest free-standing structure.
• In 2008, glass panels were installed in one of the CN Tower elevators, which established a world record (346 m) for highest glass floor paneled elevator in the world.
• On top of this is a 102-metre (334.6 ft) tall metal broadcast antenna, carrying TV and radio signals.
• The main deck level is seven storeys, some of which are open to the public.
• On August 1, 2011, the CN Tower opened the EdgeWalk, an amusement in which thrill-seekers can walk on and around the roof of the main pod of the tower at 356 m (1,168.0 ft), which is directly above the 360 Restaurant.
• It is the world's highest full-circle, hands-free walk. Visitors are tethered to an overhead rail system and walk around the edge of the CN Tower's main pod above the 360 Restaurant on a 1.5 m (4.9 ft) metal floor.
• The CN Tower is the tallest freestanding structure in the Americas. 
• The only other freestanding structure in the Americas to exceed 500 m (1,640.4 ft) in height is the Willis Tower in Chicago, which stands at 527 m.