The sanctuary is originally two buildings named after Merenid sultans: the 13th century Mosque of Abu Youssef and the 14th century Zawiyya of Abu al-Hassan.
Much of the original structure now lies in ruins, especially the mosque has fared poorly. Of the two minarets originally flying above the sanctuary, only the one of the zawiyya remains. Thankfully, it is in very nice condition, with much of the original zellij mosaics intact. Its top has since long been taken over by storks, building their huge nests. Storks are in Moroccan culture considered a sign of good fortune. Something that may be called a miniature minaret tops the real minaret; it seems almost to have been added for the storks.
The mosque has a few graves lain out on the ground (see lower left photo), but the tomb of Abu Youssef has not been identified.