Toronto's most famous landmark is the CN Tower, a 553 metre (1,815 ft) tall steel and concrete transmission tower, the tallest free-standing land structure in the world. Directly west of it is the Rogers Centre (formerly SkyDome), the world's first sporting arena to feature a fully retractable roof. It is currently home to the Toronto Blue Jays and the Toronto Argonauts. Nearby, the Air Canada Centre is the home of the Toronto Maple Leafs, the Toronto Raptors, and the Toronto Rock. It was originally built to replace the legendary Maple Leaf Gardens.
