On the way to the main shopping street, the intersection of the old town - "shakhristan" formed the central architectural ensemble of Bukhara, which forms its unique silhouette - a complex Poi Kalon, which means "Base of the Great", refers to the base of the great minaret Kalon. It is an ancient historical site. To the south of the Ark fortress, traditionally, from the VIII century, over and over again built, crumbled, rebuilt after fires and wars, moving from place to place, building the main mosque of the city. The last such building prior to the current Kalon Mosque, this place was built in 1121 by Karakhanids ruler Arslan Khan.