Frankfurt am Main is the largest city in the German state of Hesse and the fifth-largest city in Germany after Berlin, Hamburg, Munich and Cologne, with an end-2006 population of 661,877. The Frankfurt urban area, which extends beyond the city boundaries, had an estimated population of 1,468,140 in 2000. The city is at the center of the larger Frankfurt Rhine Main Area which has a population of 5 million and is Germany's second largest metropolitan area. St. Paul's Church (Paulskirche) is a national historic monument in Germany with great political symbolism, because it was the seat of the first democratically elected Parliament in 1848. It was established in 1789 as a Protestant church but was not finished until 1833. Its importance has its root in the Frankfurt Parliament, which met in the church during the revolutionary years of 1848/49 in order to write a constitution for a united Germany. The attempt failed because the monarchs of Prussia and Austria did not want to lose power, and in 1849 Prussian troops ended the democratic experiment by force of arms and the parliament was dissolved. Afterwards, the building was used for church services again. Frankfurt hosts several festivals, fairs, and carnivals throughout the year. The most famous is the Rheingau-Music-Festival with many (mostly classical) concerts at castles and under the open sky surrounded by vineyards. It's an annual festival, taking place in May. Another major festival in the city is the "Museumsuferfest"; "Museum-Riverbank-Festival". It is one of the biggest cultural festivals in Germany, which offers the opportunity to see, buy, smell, taste and hear new things from all around the world. The festival takes place yearly at the end of summer and attracts an average of 3 million visitors. The festival goes over a period of 3 days and ends with a spectacular show of fireworks. Frankfurt is also known for having one of the largest red light districts in Germany in vicinity of the Hauptbahnhof.