As river cruising continues to boom, more and more lines compete for attention on the European waterways. While many American travelers have heard of companies such as Viking, Grand Circle, Tauck, AmaWaterways, Crystal and Avalon -- to mention just a few -- there are also some European companies out there that Americans probably don't know that may deserve consideration. Here's a look at who they are and what they offer. #Cruise #RiverCruise #Travel
