Baku, the capital and main city of Azerbaijan, is located on the shores of the Caspian Sea in the Apcheron peninsula. It is a cosmopolitan city, housing the "expats" who work on the exploitation of oil and natural gas and there are various remains there of Arabian and Persian architecture. In the heart of the Old Town with its narrow streets, mosques and minaret which dates from 1078, you will find the vast 9th century fortress of Icheri-Shekher. Caravanserais (roadside inns), dating from the 14th and 16th centuries, have been completely restored and transformed into restaurants. The (15th century) palace of the shahs of Shirvann, which has perfectly preserved domes and arches, has today been transformed into a museum containing a mausoleum and Turkish baths. The Dzhuma Mosque houses the Museum of Carpets and Applied Arts.