The Delta Queen Steamboat Company is celebrating the 10th anniversary of the launch of its American Queen with four special cruises between July 23 and August 13. Passengers will enjoy commemorative mementos and onboard anniversary celebrations. Three of the cruises are designated as "Family Riverventures." These cruises will sail between New Orleans and Memphis on July 23-29, August 6-13 and August 13-20, with fares from $1,790-$2,035 per person double. A fourth designated anniversary cruise is an eight-night "Legends of American History" voyage roundtrip from New Orleans between July 29 and Aug. 6. Fares start at $2,390 per person double.