The Calgary Tower is a 191meter free standing observation tower in Downtown Calgary, Alberta, Canada. Originally called the Husky Tower, it was conceived as a joint venture between Marathon Realty Company Limited and Husky Oil as part of an urban renewal plan and to celebrate Canada's centennial of 1967. The tower was built at a cost of $3,500,000 and weighs approximately 10,900 tonnes, of which 60% is below ground. It opened to the public on June 30, 1968 as the tallest structure in Calgary, and the tallest in Canada outside of Toronto. It was renamed the Calgary Tower in 1971.
The building was a founding member of the World Federation of Great Towers.