Backpacking Europe (Paris France to Barcelona Spain to Rabat Morocco) solo need help deciding cities?

I plan on backpacking Ireland and then flying to Paris and back packing to Rabat, Morocco alone. I have already been through much of Europe when I graduated high school but I would like to go back and explore what I have yet to see. I've been researching for weeks and I am having a very difficult time figuring out what cities I should go through to get there. I will be in Europe from June 1st to August 1st of 2014. Any suggestions?
 
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