river cruising budapest to amsterdam by riverboat 15 days | 2025-2026 amsterdam, budapest, vienna, rothenburg, köln, bratislava take an amazing journey past ancient castles and soaring cathedrals, taking in great cities including vienna, köln, nürnberg and bratislava – and revered unesco world heritage sites like schönbrunn palace and kölner dom (cologne cathedral). hungary slovakia austria germany netherlands expand from $8,390 ? from price, per person price shown is the lowest price per person, double, on most journeys. view tour compare