The distinctive Calgary Tower is a 600+ foot free standing observation tower in Centre of Downtown. It was originally called the Husky Tower and was conceived as part of an urban renewal plan and to celebrate Canada's centennial of 1967. It opened to the public on June 30, 1968 as the tallest structure in Calgary, and the tallest in Canada outside of the CN Tower in Toronto.
Like it's Ontario Doppelganger, there's a glass floor extension on the north side of the tower's observation deck so you can look straight down on the streets below (in this case on 9th Avenue South and Centre Street). There's also a rotating restaurant above and a Calgary Tourism Office (and souvenir) below. $17 will get you to the top for a view and for a better price I'd recommend taking a 1.5 hour drive over to Banff.