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Even though they were ultimately built to 110 stories each, the Twin Towers were originally planned to have 80 to 90 floors. The Port Authority public relations staff recommended the change to make them the world's tallest buildings.
The Tokyo Skytree, completed in February 2012, reaches a height of 634 m (2,080 ft), making it the tallest tower, and second tallest free standing structure in the world. 1 Entirely self-supported towers 1.1 Towers taller than 250 metres. 1.2 Towers between 200 and 250 metres tall. 1.3 Towers between 100 and 200 metres tall.