<P> Towers include observation towers, monuments and other structures not generally considered to be "habitable buildings", they are meant for "regular access by humans, but not for living in or office work, and are self - supporting or freestanding, which means no guy - wires for support", meaning it excludes from this list of continuously habitable buildings and skyscrapers as well as radio and TV masts . </P> <P> Bridge towers or pylons, chimneys, transmission towers, and most large statues allow human access for maintenance, but not as part of their normal operation, and are therefore not considered to be towers . </P> <P> The Tokyo Skytree, completed in February 2012, is 634 m (2,080 ft), making it the tallest tower, and second - tallest freestanding structure in the world . </P> <P> The following is a list of structures that have historically held the title as the tallest towers in the world . </P>

What is the biggest tower in the world today