The historic center of San Vittore del Lazio is perched on a hill at 210 m s.l.m. and is easily accessible from many directions. Being on the Rome-Naples direction of the A1 motorway with the exit at the San Vittore barrier, it is easily accessible along the hairpin bends that lead directly into the historic area.
The oldest part of the inhabited center is essentially composed of the three districts that originate from the fortification work that started in the Middle Ages. The access to these three districts starts from the very central Piazza Municipio: the ancient via Castello, a ring road located inside the walls of the ancient fortification, which connects the two edges of the Largario Corte dei Santi; via Roma, formerly called Borgo Santa Maria or il Colle; via Greci, part of the ancient Borgo de li Greci already mentioned in the section dedicated to the Church of San Nicola.
Of particular interest are the nineteenth-century fountain with an octagonal base in Piazza Municipio. Still in the same square, there is an imposing keep with a pointed arch, the main entrance door to the ancient castle.
Like most of the inhabited centers of medieval origin, the ancient part of San Vittore is characterized by a maze of alleys that winds without solution of contuity, almost all communicating with each other thanks to the presence of passages, bottlenecks and steep stairways thanks to which it is possible to admire the beauties of the historical center.