Budapest is the capital and largest city of Hungary. It became a single city occupying both banks of the river Danube with the unification in 1873 of Buda and Óbuda (Old Buda) on the right bank with Pest on the left bank. One of the most beautiful cities in Europe Budapest has many World Heritage Sites including the banks of the Danube, the Buda Castle Quarter, Andrássy Avenue and the Millennium Underground railway, the first underground on the European continent.
Exciting attractions in this historic city include Heroes' Square, Andrássy Avenue, St. Stephen's Basilica, Parliament, Castle District and the Citadel. Cruises along the Danube, especially in the evening, are very popular.