The Registan was the heart of the ancient city of Samarkand of the Timurid Empire. It consists of the Ulugh Beg Madrasah (1417–1420), the Sher-Dor Madrasah (1619–1636), and the Tilya-Kori Madrasah (1646–1660) Samarqand, is a city in southeastern Uzbekistan and among the oldest continuously inhabited cities in Central Asia. There is evidence of human activity in the area of the city from the late Paleolithic Era, but the city itself was fully established by the 8 cnetury BCE. Prospering from its location on the Silk Road between China and Europe, at times Samarkand was one of the largest cities of Central Asia. The city was conquered by Alexander the Great in 329 BCE, when it was known as Markanda 3D model made in Reality Capture using 14,145 drone images.