The Aljube stands opposite Lisbon Cathedral and was a prison for most of the time there has been a city around it. Under the Estado Novo the political police held people here: writers, students, trade unionists, communists, soldiers and priests. It stopped being a prison in 1965 and opened as a museum in 2015, and it is now the place in Lisbon where the forty-one years of dictatorship are set out in one building.
The exhibition fills four floors and is built in two halves. The first sets out how the machine worked. The second is the people it was used on, with their files, their photographs and their recorded voices, so the higher you climb the less abstract it becomes. Two men ran the country across those forty-one years: António de Oliveira Salazar, and Marcelo Caetano after him. The Aljube had been a church prison and then a women's prison before it was a political one, and the museum keeps the four floors in the shape the prison used them.