The San Vittore prison in Milan is located in Piazza Filangieri 2. Its construction began in May of 1872, and the structure was opened on July 7, 1879 during the reign of King Umberto I. For the construction of the new facility the government commissioned engineer Francesco Lucca, who took the 18th century model of the "panopticon" as a model and designed a building with six arms of three floors each. Piazza Filangieri was built a medieval-style building where were located the offices and the home of the director. Originally medieval style was also the wall, but today has been almost completely rebuilt for safety reasons.