There are many good cruise lines that offer cruises to European cities. The prices will depend on where you want to cruise to and when you want to go.
The main cruise line that does European cruises as well as Dead Sea Cruises is called the Princess Cruise Company. Their cruises are pretty expensive.
I believe you are looking for Avalon Waterways. In Europe they offer award winning river cruises through Austria, Croatia, France, Germany, and Serbia...just to name a few! Check out more details and see all Avalon's European river cruises on their website at http://avalonwaterways.com/Cruise-Vacations/River-Cruises-Europe/
A selection of companies offer Luxury Greek cruises such as 'P&O', 'Windstar cruises'. 'Oceana cruises', 'Olivia Travel', 'Frommers' and 'Silver sea cruises'.
Mediterranean cruises offer special opportunities many other cruises don't. Most mediterranean cruises offer regional cuisine, on board activities and performances.
Royal Carribean International, Captain Cook Cruises, Oceania Cruises, PO&O Cruises, Classic International Cruises, Hapag-Lloyd Cruises, Orion Expedition Cruises, Princess Cruise Line, and Silversea are some examples that offer cruises in Australia.
There are many companies that offer cruises to Hawaii. Some companies offering these cruises include 'Royal Caribbean', 'Carnival', 'Princess Cruises' and 'Norwegian Cruise Line'.
There are many companies that offer cruises along the Rhine. Two German companies that offer great packages for cruises include the Loreley Linie and KD.
Viking River Cruises, Eqypt Cruises and Nile River Cruises are the 3 main companies in Egypt that offer cruises along the Nile. One can likely book these cruises from a travel website.
Most major cruise lines offer New Zealand cruises. Some examples of cruise lines that offer New Zealand cruises include Royal Caribbean, Princess, and Celebrity cruises.
There are several companies that offer Danube cruises. Try Viking River Cruises (http://www.vikingrivercruises.com/regions/europe/rivers/danube/about.aspx), Avalon Waterways (http://www.avalonwaterways.com/Cruise-Vacations/Danube-River/), or Euro River Cruises (http://eurorivercruises.com/Destinations/danube.htm).
Expedia does offer some Disney cruises as part of larger travel packages. The best place to find a full list of Disney cruises will be on Disney Cruises's official site.