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Detail of left side of Duan-Beggi medrese, Bukhara, between 1905 and 1915. Possibly a view of the Nadir Devanbegi Madrasah. Russian chemist and photographer Sergey Prokudin-Gorsky (1863-1944) was a pioneer in colour photography which he used to document early 20th-century Russia and her empire, including the vanishing way of life of tribal peoples along the Silk Route in Central Asia. In a railway-carriage darkroom provided by Czar Nicholas II, Prokudin-Gorsky used the three-colour photography process to record traditional costumes and occupations, churches and mosques - many now Unesco World Heritage sites - as well as modernisation in agriculture, industry and transport. Detail of left side of Duan-Beggi medrese, Bukhara, between 1905 and 1915. Creator: Sergey Mikhaylovich Prokudin-Gorsky. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)