Birds circle Ulugh Bek Madrassah's minaret in Registan Square, Samarkand, Uzbekistan

ulugh beg madrasa registan square samarkand uzbekistan minaret intricate mosaics persiantimurid fusion masterful craftsmanship unesco heritage site central asia timurid dynasty astronomy 15th century timur tamerlane silk road blue dome calligraphic inscriptions historical landmark ornate portal timurid era islamic architecture scientific achievements sextant astrolabe observatory persian influence tilework geometric patterns gure amir mausoleum bibikhanym mosque shahizinda necropolis world heritage site trade public gathering place greek influence tilyakori madrasa sherdor madrasa persian empire cultural legacy tourism architecture history culture landmarks tourist attractions islamic art historical sites sightseeing