Muslim rulers from in and around the region long tried to take the city and keep it in their control, and thus, much like most of the Hejaz region, the city has seen several regime changes. The city was finally conquered in the Saudi conquest of Hejaz by Ibn Saud and his allies in 1925. Since then, Mecca has seen a tremendous expansion in size and infrastructure, with newer, modern buildings such as the Abraj Al Bait, the world's fourth-tallest building and third-largest by floor area, towering over the Great Mosque. The Saudi government has also carried out the destruction of several historical structures and archaeological sites, such as the Ajyad Fortress. Non-Muslims are strictly prohibited from entering the city.