Europe by boat

Me and several other people are planning on meeting up with some people in Europe.  Problem is, I don't make too much money and plane tickets are expensive. I'm wondering if its possible to take a boat; I've heard of people doing it. I've goggled a lot and cant find any information regarding such a endeavor. If somebody here has any knowledge on the subject, it would be most appreciated.

Bamp

If you come to Europe you should bring lots of money.

to what country are you going?