what cruises leave the united states and travel to eurpoe?

Most Cruiselines offer European itenararies. Royal Carribean and Carnival both offer 14 day cruises to Europe, but leaving from Spain. I don't believe there are many that depart from the U.S. Check with your travel agent if this doesn't help you.

Most cruise companies do this itinerary. The legendary one is Cunard on the Queen Elizabeth

Here are some links to information on cruising to Europe:

http://cruisecritic.com/ports/area.cfm?area=14

http://cruisecritic.com/ports/area.cfm?area=20

http://cruisecritic.com/ports/area.cfm?area=15

http://cruisecritic.com/ports/area.cfm?area=16

If you just look around, you will be able to find lots of information and also some cruises that may interest you.

One cruise that you may like would be : http://cruisecritic.com/bargains/news.cfm?NewsID=4885

or something like this: http://cruisecritic.com/bargains/news.cfm?NewsID=4884

I hope this gets you some ideas!