After World War I many memorials to that conflict were raised in the area, the most significant being the Grade I listed Cenotaph in Whitehall.
So great is the number of monuments in the borough that Westminster City Council has deemed an area stretching from Whitehall to St James's to be a "monument saturation zone", where the addition of new memorials is generally discouraged.
The most prominent of these is at the Fourth plinth in Trafalgar Square, which has shown works by contemporary artists on rotation since 1999.
Temporary outdoor displays of sculpture can also be seen at the Royal Academy and the Chelsea College of Arts.
[3] Initially intended for the run-up to the 2012 Olympic Games in London, the project's duration has been extended beyond that point.