Wiesbaden is a city in central western Germany and the capital of the federal state of Hesse. In July 2016, it had about 288,000 inhabitants, plus approximately 19,000 United States citizens. The Wiesbaden urban area is home to approx. 560,000 people. The city, together with nearby Frankfurt am Main, Darmstadt and Mainz, is part of the Frankfurt Rhine Main Region, a metropolitan area with a combined population of about 5.8 million people. Wiesbaden is one of the oldest spa towns in Europe. Its name translates to "meadow baths", making reference to the hot springs. It is internationally famous for its architecture, climate, and its hot springs. At one time, Wiesbaden boasted 26 hot springs. Fourteen of the springs are still flowing today. In 1970, the town hosted the tenth Hessentag state festival. The city is considered the tenth richest in Germany with 113.3% of gross domestic product. Every citizen has an average annual buying power of €24,798.