the CN Tower

The CN Tower is a radio tower located in Toronto, Ontario, Canada.  The original English name "CN" was originally an abbreviation of "Canadian National", and is now an abbreviation of "Canada's National", but neither name is often used.  With a height of 553.33 meters, the tower is now the fifth tallest free-standing building in the world. The tower is considered a Toronto landmark and attracts more than 2 million visitors each year.