After embarking in Regensburg, take a day trip to explore centuries-old Weltenburg Abbey, where the hallowed halls and serene surroundings create an atmosphere of reverence and contemplation. In Passau, explore St. Stephen’s Cathedral, known for its baroque architecture, ornate interiors, and the largest cathedral organ in the world. Hike up to the Durnstein Castle for panoramic views of Durnstein, rolling vineyards, and the meandering river. The melodies of Strauss guide you to Vienna, Austria’s opulent “City of Music.” A visit to Schönbrunn Palace, a UNESCO World Heritage Site, unravels the threads of imperial history, showcasing the splendor that once graced royal life. Before wrapping up your adventure with a full day in Budapest, where the vibrant spirit of Hungary fills the air, enjoy the idyllic castles and romantic terraces of Bratislava.