Photo galleries, courtesy of:  USA Today Travel

Alaskan Dream Cruises: Admiralty Dream
American Safari Cruises: Safari Explorer
Azamara Club Cruises: Azamara Journey
Avalon Waterways: Avalon Panorama
Celebrity Cruises: Celebrity Eclipse; Celebrity Constellation; Celebrity Century; Celebrity Solstice; Celebrity Silhouette
Carnival Cruise Lines: Carnival Magic; Carnival Destiny; Carnival Ecstasy; Carnival Splendor; Carnival Inspiration;Carnival Liberty; Carnival Valor; Carnival Dream
Celebration Cruise Line: Bahamas Celebration
Compagnie du Ponant: Le Boreal
Costa Cruises: Costa Favolosa; Costa Deliziosa
Cruise & Maritime Voyages: Marco Polo
Crystal Cruises: Crystal Symphony
Cunard Line: Queen Mary 2; Queen Elizabeth; Queen Victoria; Queen Mary (retired)
Disney Cruise Line: Disney Wonder; Disney Fantasy; Disney Dream
Fred. Olsen Cruise Lines: Braemar
Great American Steamboat Co.: American Queen
Hapag-Lloyd: Europa
Holland America Line: Nieuw Amsterdam; Eurodam; Oosterdam; Statendam
InnerSea Discoveries: Wilderness Discoverer
Louis Cruises: Louis Majesty
MSC Cruises: MSC Fantasia
Norwegian Cruise Line: Norwegian Jade; Norwegian Sky; Norwegian Epic; Norwegian Gem
Oceania Cruises:  Riviera; Marina
Princess Cruises: Ruby Princess; Crown Princess; Emerald Princess; Sapphire Princess
Regent Seven Seas Cruises: Seven Seas Mariner
Royal Caribbean International: Oasis of the Seas; Allure of the Seas
Seabourn Cruise Line: Seabourn Sojourn and Seabourn Odyssey; Seabourn Quest
Silversea: Silver Spirit
Vantage Deluxe World Travel: River Discovery II
Viking River Cruises: Viking Odin
Voyages to Antiquity: Aegean Odyssey
Voyages of Discovery: Discovery
Windstar Cruises: Wind Surf; Wind Spirit