In the Middle Ages, the structure was repurposed as a fortress, before then being converted into a garden, and later a bullfighting arena. In the 19th century, a concert hall was built into the brick and concrete shell of the tomb.
This was ripped out in the 1930s, when Mussolini’s fascist government decided to expose and isolate the ancient monument. The surrounding neighborhood was also demolished and replaced with a quadrangular piazza defined by heavy, rationalist buildings on three sides, and a pavilion to display another recently excavated Augustan monument, the Altar of Peace, on the fourth.
The pavilion was replaced in 2006 with a new, controversial museum, designed by American architect Richard Meier. That year, a competition was also held to redesign the area immediately around the Mausoleum and was won by a group headed by Italian architect Francesco Cellini. It is this vision which, after a considerable delay, has now been partially realized.