The Aidrus Mosque sits on Aidrus Street in central Crater and is the most important religious building in Aden. Founded in the early 16th century around the tomb of the Sufi saint Abu Bakr al-Aydarus, it has been rebuilt several times since, most recently after damage during the 1994 civil war.
The whitewashed prayer hall, slender minaret, and walled courtyard are typical of Hadramawt mosque architecture and unlike anything else in coastal Yemen. The interior is reserved for worshippers but the courtyard and exterior are accessible. The mosque is at the heart of one of the densest blocks of old Aden — the lanes around it preserve some of the city's last late-Ottoman houses.