Sixt has been operating an office in Hungary since 1999, the downtown office is located in the Danubius House at 141 Váci street in the 13th district. Budapest is the capital and the largest city of Hungary ,it is also the largest city in East-Central Europe and the eighth largest in the whole European Union. Budapest is often mentioned as one of the most beautiful cities in Europe. The banks of the Danube, the Buda Castle Quarter, , Andrássy Avenue, Heroes' Square and the Millennium Underground Railway which is the second oldest in the world have been declared to be World Heritage sites by UNESCO. Other highlights are the circa 80 geothermal springs which is the biggest thermal water cave system in the world or the second largest synagogue and the third largest parliament building. Each year around 2.7 million tourist come to Budapest this makes Budapest to the 37th most popular city in the world according to Euromonitor.