The heart of the Old Part is occupied by Constitución Square. Up until the forties, its central building was San Sebastian's City Hall.
The balconies of the aesthetically coloured buildings that line the square bear numbers left over from its past when it was used as a bullring and the balconies were hired by spectators.
Today, however, Constitución Square is a place full of life and the main site of the most important local fiestas.