This spring, watch European countryside sprinkled with castles and historic cities float past your oceanview cabin aboard a 7-night Danube River cruise.

Save $400 on the same cruise just two weeks earlier. This April 28 departure is aboard one of Viking River Cruises' newest ships, the Viking Odin.

For for $2255 per person, sail from Germany to popular cities in Austria, Slovakia and Hungary. This Viking River Cruise itinerary includes:

• Shipboard accommodations
• Shore excursions
• Lectures and cultural performances
• On-board meals, coffee, tea and wine (with dinner while on board)
• Port charges
• Hotel accommodations during city stays

Depart from Passau, Germany and then visit Salzburg, Melk, Durnstein and Vienna, Austria;  Bratislava, Slovakia; and end the journey in Budapest, Germany.

Note: Priceline.com charges a $25 fee to book this deal over the phone.