Kalon Mosque, Bukhara.
The Kalon Mosque (also "Kalyan Mosque") is the biggest mosque in Bukhara and the second-largest historical mosque in Central Asia (after Bibi-Khanum Mosque in Samarkand). It is a part of the Poi-Kalon ensemble and is built on the Kosh principle (two buildings opposite each other) opposite the Miri-Arab Madrasah.