empires of the lower danube (2028) belgrade to bucharest | 9 days uncover the best-kept secrets of europe on a cultural expedition through bulgaria, romania, and serbia, three diverse nations at the heart of a region prized by the greatest empires in european... ships: s.s. emilie, s.s. helen countries: bulgaria, romania, serbia river: danube from $3,999* per person based on double occupancy. *from price based on april 16, 2028 itinerary. available on a limited number of staterooms. single supplement applies. view itinerary dates & pricing