When the 90-metre antenna was bolted into place on 14 October 1958, Tokyo Tower was the tallest freestanding tower in the world, taking the title from the Eiffel Tower by 13 metres. Despite being taller than the Eiffel Tower, Tokyo Tower only weighs about 4,000 tons, 3,300 tons less than the Eiffel Tower. While other towers have since surpassed Tokyo Tower's height, the structure was still the tallest artificial structure in Japan until April 2010, when the new Tokyo Skytree became the tallest building of Japan. Copyright Wikipedia