The centre of Rotterdam comprises four diverse areas: the Park Triangle, the Centrumruit (area around the Lijnbaan), the City Triangle and the Kop van Zuid. Binnenrotte is the central area of the City Triangle and becomes the focus of attention twice a week when the city market is held: an event which can bring together 70,000 people. Before the bombings of the Second World War, the historic centre of Rotterdam, around Binnenrotte, was dominated by the railway viaduct and areas of modest buildings. It was a narrow and claustrophobic centre. Besides the section of the square which was the site of the main market, located in the docks of the old harbour, there was no other square or public space which could be considered the heart of the city. After the war, the great opportunity arose to create a new centre in the city; but the urban reality over recent decades has been an increase in density in this centre due to the building of residential and office buildings around the fast roadways.