Immerse yourself in the Danube's history and culture as you spend two days in stunning Vienna, see Hungary's largest church and tallest building – the dome-capped Basilica in Esztergom – and pass another two days exploring the historic capital of Hungary, Budapest. Enjoy a day in Bratislava, Slovakia, before sailing back past Vienna overnight to spend a morning cruising though the glorious scenery of the Wachau Valley to Melk.