A new cafe in the sky will be opened at the Spinnaker Tower to mark the attraction's fifth birthday.
The cafe will be 105 metres up on View Deck Two and will mean visitors will be able to sit down with a cuppa and admire the scenery.
It will be launched on Monday, October 18, the date when the tower celebrates its birthday.
Juliana Delaney, chief executive of the tower's operating company, Continuum, said: 'Five years is a very significant milestone.
'We want to say a massive thank you to everyone who has supported the tower since its inception and to encourage people to support it for the next five years and beyond.'
The tower will be lit up like a candle, complete with flickering lights, from Monday, October 11, making it look like a huge birthday candle.
And discounted entry to the attraction will be extended so people living in all Portsmouth postcode areas will be able to claim 25 per cent off the entry fee until January.
And from today, five 'golden' Spinnaker Tower passes are to be hidden around the city for people to find.
Those lucky enough to get one will be able to visit the attraction for free for the rest of their lives.
Ms Delaney added: 'The Spinnaker Tower has welcomed more than two million visitors.
'The tourism impact has been enormous, with the tower directly generating multi-millions of pounds for the Portsmouth economy, and we should celebrate this success.
'The Spinnaker Tower has become part of the World Federation of Great Towers, joining the ranks of the world's greatest towers including the Eiffel Tower, the Empire State building, Seattle Space Needle and Burj Khalifa in Dubai - showing how this icon for Portsmouth and the south has now clearly taken its place on a world stage.
'It is something the people of Portsmouth can be proud of.'
The tower is open between 10am and 6pm every day. Go to spinnakertower.co.uk