The city was a large political and religious center in the Middle Ages with over 350 mosques and 80 madrasahs (Islamic colleges), many of which survive. The historic center of Bukhara is a UNESCO World Heritage Site. Sightseeing in Bukhara: Lyabi Hauz Architectural Ensemble, Kukeldash Madrasah, Nadir DivanBegi Madrasah, domed shopping arcade.