чем известна трафальгарская площадь по британский

Trafalgar Square is a public space and tourist attraction in central London. 
Nelson's Column, with the statue of Admiral Lord Nelson on top, rises in the centre of Trafalgar Square. This most impressive monument is 170 feet (about 52 m) tall. 
To the north-east of Trafalgar Square there is the building that houses the National Gallery of Art - one of the most important Art Galleries in the world and behind is the National Portrait Gallery. There are two statues on the lawn in front of the National Gallery: James II  to the west of the portico, and George Washington to the east. 
There are many pigeons in the square and Londoners like to feed them. 
Quite often the square becomes the location for meetings and in it crowds of Londoners congregate to celebrate political rallies. So it can be said that Trafalgar Square is the heart from which the beat is emitted to all the Londoners.