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.
More top news
Pupils at many of the capital's schools and nurseries breathe toxic air which can permanently damage health
Squatters shacked up in a grand building metres away from Buckingham Palace have been evicted in an early morning "stealth mode" operation
Four men have been arrested after a 21-year-old man was murdered in Lewisham