Structures and towers are listed separately from skyscrapers. The Warszawa Radio Tower on the outskirts of Warsaw, Poland, was the tallest structure ever built. Although it needed to be supported by long cables to keep it up, the tower reached 646 meters (2,119 feet) into the sky. Unfortunately, in August 1991, the tower came crashing down during repair work.

The tallest structure ever built that is still in existence is the KTHI-TV tower in North Dakota, which stands—with the help of cables—629 meters (2,063 feet) tall. The tallest self-supporting tower in the world is the Canadian CN Tower, whose tip is 553 meters (1,815 feet) above the city of Toronto.