The Orbit Tower has divided opinion, but with breathtaking views of the Olympic Stadium and the City of London, visitors like what they see.
A critic called the piece of public art "a party animal of a building", the tower was designed to give "something extra" to the park.
The distinctive steel structure, created by sculptor Anish Kapoor and designer Cecil Balmond, stands at 115m and could remain on the site as a permanent reminder of the Games.
The observation tower is made of tubular steel and offers amazing views of the Olympic Stadium and the City of London.
Its official name is Arcelor Mittal Orbit and the bulk of the finance to build it came from steel tycoon Lakshmi Mittal, Britain's richest man.