The Calgary Tower is a 191-metre (626 feet) free standing observation tower....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....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. Source: Wikipedia