Hundreds of thousands of Christmas trees in London will be disposed of this weekend.
It stood empty for 150 years, but has definitely made up for it since.
Statues have gone on display in Trafalgar Square of injured servicemen and are a tribute to their determination to rebuild their lives.
Mayor of London Boris Johnson says the fourth plinth has become an important part of London's art scene:
"I am immensely proud to support the Fourth Plinth, which has become a must-see cultural attraction for London, one that underpins the capital's status as a great world city for art. Just a few minutes walk away from Trafalgar Square itself, this exhibition promises a fascinating journey through the work of some of the best international artists working today."
It stood empty for more than 150 years - an empty plinth whose intended artwork was never completed.
But over the last 14 years, the fourth plinth in Trafalgar Square has hosted some of the world's most feted contemporary art.
Now its role in the arts world is being formally celebrated, in a special exhibition at the Institute of Contemporary Arts.
The Christmas tree shipped from Norway arrived in Trafalgar Square this morning.
Trafalgar Square was guarded by a battalion of soldiers. Sculptures of 20 wounded servicemen were unveiled there. Rags Martel reports.
Twenty statues are on display in Trafalgar Square. The sculptures are of injured servicemen, and are a tribute to their determination to rebuild their lives after they were injured. It's ahead of National Heroes Day, which is this Sunday, and has been organised by Help For Heroes.
The statues were in place from 8am today and will be there until 3pm. From there they will be moved to places of significance around the servicemen's home towns. Rory Mackenzie, Simon Brown and Colin Luther-Davis are the three London based soldiers who have been honoured.
Sculptor Stuart Murdoch has created a battalion of 20 statues of veterans, capturing the determination of each individual to rebuild their lives after injury. The veterans themselves were there to see their sculptures unveiled.
One lane blocked due to broken down van on A4 Trafalgar Square at A400 Northumberland Avenue / A3212Whitehall / The Mall.
The big screens are back for the Paralympics, letting those without tickets watch the action in parks, open spaces and London's famous landmarks. Trafalgar Square will be hosting live acts every day, as well as offering a sports court so that people can try Paralympic events for themselves.