Palazzo dβAvalos
This palace is one of the main attractions at Terra Murata. It was constructed in 1500 but was converted to a military school centuries later in 1815, and then a prison in 1830. Only recently, as soon as 1988 (in my lifetime!), was the prison closed. You are welcome to see the Palazzo/prison, but only with advance bookings online. The complex is composed of the Palazzo dβAvalos itself, a courtyard, barracks, prison cells, medical center, house director, and an esplanade. You can get a great view of the Palazzo from the Punta dei Monaci.