"yezrod" is certainly not a really useful title for a question.
http://www.kassel.de (some info in English)
http://www.kassel-tourist.de (only in German)
Most important sight is the park Wilhelmshöhe.
The Hauptbahnhof (main railway station) lost it's importance with the new ICE railway station Wilhelmshöhe and was transferred into a Kulturbahnhof (culture railway station). Quite interesting (even the toilets).
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