Claiming the title of world's tallest tower, the structure measures 2,080 feet or 0.39 mile, The Yomiuri Shimbun reported Wednesday.
Another claim to fame is the tower's survival of the eastern Japan earthquake March 11, 2011. The structure, which relays television and radio broadcast signals, was not damaged by the quake and became a symbol of hope to many in Japan.
Tokyo Skytree is expected to help Japan attract more overseas tourists and draw huge crowds to the heart of Tokyo.
A crowd was on hand for the official opening Tuesday.
The first visitor to reach the 1,100-foot high observation deck was Ayumi Nakazawa, who was chosen for the honor through a nationwide contest to name the tower.
Nakazawa was among more than 32,000 people who favored the name Tokyo Skytree.
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