Gasr Al-Hajj is a huge fortified granary of circular shape built in the 13th century AD by Abdallah Abu Jatla. It is located on the Tripoli-Aziziya-Al Jawf route in Libya about 130 km from Tripoli. It was built to serve as granary for families from the surrounding area in return for quarter of their crops, which, it is said, the owner had endowed as a waqf for teaching Qur'an and Islamic related subjects to the people of the area.