Endowment of King Abdul Aziz for the Two Holy Mosques Project is one of the largest architectural projects in the world. It is developed on 1.5 million square meters. It consists of seven adjacent towers with a height of 600 meters. Their capacity is 65 thousand people. The project includes a mosque accommodating 3,300 worshipers, in addition to parking lots linked to underground tunnels under the building and accommodating more than 1,000 vehicles. They also include water tanks with the capacity of more than m3 53,000, for water provision, especially at peak times, and around the clock.