For 10 points, name this city in Uzbekistan that once served as the capital of Tamerlane's empire.
The massive Fakhri sextant was once housed inside an observatory in this city. The builder of that observatory founded a madrassa that, along with the Sirdar and Tilkari madrassas, bounds this city's Registan Square, and was named Ulugh Beg. A tiled turquoise dome tops this city's Bibi Khanum Mosque. The exhumation of a body in this city by Mikhail Gerasimov, a pioneer of forensic facial reconstruction, coincided with the (*) Nazi invasion of the Soviet Union. Before it was conquered by the khanate of Bukhara, this city's most famous resident ordered the construction of the GurÂ­e Amir mausoleum complex. For 10 points, name this city in Uzbekistan that once served as the capital of Tamerlane's empire.
The massive Fakhri sextant was once housed inside an observatory in this city.
Samarkand