Trafalgar Square is a square in central London, England. With its position in the heart of London, it is a tourist attraction; its trademark is Nelson's Column which stands in the centre and the four lion statues that guard the column. Statues and sculptures are on display in the square, including a fourth plinth displaying changing pieces of contemporary art, and it is a site of political demonstrations.
The name commemorates the Battle of Trafalgar (1805), a British naval victory of the Napoleonic Wars. The original name was to have been "King William the Fourth's Square", but George Ledwell Taylor suggested the name "Trafalgar Square".
The northern area of the square had been the site of the King's Mews since the time of Edward I, while the southern end was the original Charing Cross, where the Strand from the City met Whitehall, coming north from Westminster. As the midpoint between these twin cities, Charing Cross is to this day considered the heart of London, from which all distances are measured.
In the 1820s the Prince Regent engaged the landscape architect John Nash to redevelop the area. Nash cleared the square as part of his Charing Cross Improvement Scheme. The present architecture of the square is due to Sir Charles Barry and was completed in 1845.
From Wikipedia: en.wikipedia.org/wiki/Trafalgar_Square