Central Asian Islamic architecture was strongly influenced by Persian, Russian, Chinese and Islamic styles. Key features included massive blue domes, tilework, geometric patterns, and buildings designed to stay cool in the desert climate using water features. The historic cities of Samarkand, Bukhara and Khiva featured important architectural ensembles like the Registan mosque and madrasas in Samarkand, with their beautiful tilework, arched portals and central courtyards. Major structures included mosques, madrasas, mausoleums and caravanserais, with buildings traditionally made of fired brick. The peak of Central Asian Islamic architecture was under the Timurids, as seen in buildings like the Bibi-Khany