Sana'a is capital of Yemen. Sana'a is one of the oldest continuously inhabited cities in the world. At an altitude of 2,300 metres (7,500 ft), it is also one of the highest capital cities in the world. Sana'a has a population of approximately 1,748,000 (2010) making it Yemen's largest city. Gorgeous postcard with matching stamp of Old Sana'a. It is UNESCO WHS. Thanks you very much Karina!