La Model was built on the idea that being watched is the punishment. Six cell wings radiate from a single central hall, so that one officer standing in the middle could see down every corridor at once. It occupies an entire block of the nineteenth-century grid, which is why the streets around it end in a blank wall. It opened in 1904 and worked for a hundred and thirteen years, through a monarchy, a republic, a war, a dictatorship and a democracy.
The last prisoners left in June 2017, and what happens to the block now is the result of thirty years of pressure from the streets around it. Neighbourhood associations argued that a full square of the city was being used to hold people while the district had nowhere to put a school, a park or affordable flats. The wings are being converted into public housing, a school, a nursery, a sports hall and a home for older people. A memorial stays inside them, because the last execution in Barcelona was carried out in this building.