historic registan square with three madrasahs: ulugh beg, tilya-kori and sher-dor, samarkend, uzbekistan

registan ancient minaret architecture mosque madrasa samarkand uzbekistan landmark samarqand historic madrasah heritage culture islam religion mosaic tilyakori unesco cityscape square dome decoration muslim medieval ornament islamic geometric geometry uzbek central destination madrassa sherdor exterior madrassah city texture bukhara