The Mausoleum built to house the ashes of Emperor Augustus is one of the most important ancient monument in the city. It is situated near the river Tiber just next to the Ara Pacis Museum. As many Roman monuments, the mausoleum was converted into a fortress in the Middle Ages. Later it was used as a bull-fighter arena, a circus and latest in the 20thcentury a concert hall. After decades of abandonment hopefully in 2019, it will reopen to the public after a major restoration project.