Another railway extension was built in 1871 to serve a populated area along Bursa and the Sea of Marmara. The Anatolia Railway was then extended to Ankara and eventually to Mesopotamia, Syria and Arabia during the reign of Sultan Abdülhamid II, with the completion of the Baghdad Railway and Hejaz Railway. Under his reign, Turkey's first postage stamps were issued in 1863, and the Ottoman Empire joined the Universal Postal Union in 1875 as a founding member. He also was responsible for the first civil code for the Ottoman Empire. He was the first Ottoman sultan who travelled to Western Europe. His voyage in visiting order (from 21 June 1867 to 7 August 1867): Istanbul – Messina – Naples – Toulon – Marseille – Paris – Boulogne – Dover – London – Dover – Calais – Brussels – Koblenz – Vienna – Budapest – Orșova – Vidin – Ruse – Varna – Istanbul. Impressed by the museums in Paris (30 June – 10 July 1867), London (12–23 July 1867) and Vienna (28–30 July 1867) which he visited in the summer of 1867, he ordered the establishment of an Imperial Museum in Istanbul: the Istanbul Archaeology Museum. Family Abdülaziz's harem was known because, although slavery in the Ottoman Empire had already been abolished, her mother Pertevniyal Sultan continued to send it slave girls from the Caucasus. Consorts Abdülaziz had six consorts: Dürrinev Kadin (15 March 1835 - 4 December 1895). BaşKadin. Called also Dürrunev Kadın. Georgian, born Princess Melek Dziapş-lpa, before becoming a consort she was a lady-in-waiting to Servetseza Kadin, consort of Abdülmecid I. She had two sons and a daughter. Edadil Kadin (1845 - 12 December 1875). Second Kadın. She was Abkhazian, born Princess Aredba. She became Abdülaziz's consort at the time of his accession to the throne. She had a son and a daughter. Hayranidil Kadin (2 Novembre 1846 - 26 November 1895). Second Kadın after Edadil's death. She perhaps was of slave origin. She had a son and a daughter. Neşerek Kadin (1848 - 11 June 1876). Third Kadin. Called also Nesrin Kadın or Nesteren Kadin. Circassian, born in Sochi as Princess Zevş-Barakay. She had a son and a daughter. Gevheri Kadin (8 July 1856 - 6 September 1884). Fourth Kadın. She was Abkhazian and her real name was Emine Hanim. She had a son and a daughter. Yıldız Hanim. BaşIkbal. Sister of Safinaz Nurefsun Kadın, consort