On Friday,the ArcelorMilttal Orbit tower, the swooping red observation tower nestled between the main stadium and the Aquatics Centre, reached its full 114.5-metre height. Click through the gallery above to see how it looks.
The BBC has an interview with one of the architects who worked on the tower.
The structure won’t be finished until next year, but for now we can get a pretty good idea of how it looks on the east London skyline. It’s been one of the more controversial elements of the Olympic park, but now that it’s approaching completion, what do you think of it? Let us know.