Vacationing in Europe. Where should I go?

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So, this is what I've decided on. And this is really solely based on where everything is located. Prague would be way out of the way (sadly). Im planning on flying into Frankfurt. Then traveling southern Germany (and staying in Schwabisch Hall for 3-4 days). Then train up to Berlin for a couple days. Then over to Melle for a couple days (and take day trips to Osnabruck and Hannover). From there spend 2-3 days in Amsterdam.