Bastione Fortezza: an impressive pentagon-shaped complex that constitutes the top north-east part of the walls. Completed in 1593, it consists of Bastione della Vittoria, Bastione di Santa Lucia (facing inwards) and includes the 'Cassero Senese', 'Piazza d'Armi' and the 'Cappella di Santa Barbara' that made up the fortified citadel of Grosseto.