As the Spinnaker Tower is sponsored for the first time, here are ten things you might not know about Portsmouth’s famous landmark.
It opened in October 2005;
It took four years to build, from November 2001 until October 2005;
Plans for the tower, first called the Milennium Tower, were approved in 1995;
It is 560ft tall and weighs 30,000 tonnes;
Its foundations are buried 50m below ground;
It offers visibility across 23 miles on a clear day
It has 570 steps inside leading to the observation decks;
It has 120 windows across its observation decks;
There were originally three designs for the tower put forward. When asked, 60 per cent of the people of Portsmouth chose the Spinnaker design;
Its concrete platform provides a buffer against impact from a ship.