The Museo delle Mura ('museum of the walls') provides an exhibition on the walls of Rome and their building techniques, as well as the opportunity to walk along the inside of one of the best-preserved stretches of the Aurelian Wall. The museum is free of charge.
The museum in its present form, was officially opened in 1990. Prior to 1939, the Porta San Sebastiano (also known as the Porta Appia) had been open to the public but it was then taken over by Ettore Muti, the Secretary of the Italian Fascist Party. White-and-black mosaics in some rooms date back to that time. From 1970, there was a small museum connected to the internal parapet of the Aurelian Wall but this museum was only open to the public on Sundays, and, after a few years, was closed.
The museum provides a detailed history of wall construction in Rome and the surrounding areas, with information going back to one constructed in Ardea to the southeast of Rome in the 8th century. It describes the construction methods of the first Roman wall, built by Servius Tullius the legendary sixth king of Rome, the second wall constructed in the 4th century BC after invasion of Rome by the Gauls, and the Aurelian Walls, constructed in the 3rd century CE, as well as subsequent work to raise the height of those walls and improve defences, and more recent additions and changes up to the 20th century. In addition to text and diagrams, some models of walls are provided.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.