Built in 1880 as the Great Synagogue of Oran, this striking neo-Moorish building with its horseshoe arches and stripe-banded stonework was converted into the Abdellah Ben Salem Mosque in 1975. The architecture is one of the more curious in the city — a Moorish-revival synagogue rebadged as a mosque, with relatively little change to the exterior.
The mosque is active and busy at prayer times. The interior is open to Muslim worshippers; visitors of other faiths can usually appreciate the facade and the surrounding small square. It sits at the foot of the slope leading up to the city centre.