The Mausoleum of Moulay Idriss II is the holiest site in Fes, housing the tomb of the city's founder from the 9th century. It is considered a place of baraka (blessing) and is visited by Moroccans for prayer and blessing. The mausoleum is decorated with zellige, brass, and carved wood. Non-Muslims cannot enter but can glimpse inside from the entrance. The area around the shrine was historically a sanctuary for criminals and debtors.