Imhoff-Stollwerck Chocolate Museum, Cologne
Find everything you want to know about chocolate making process in this world famous chocolate museum. Near exit you can buy exotic chocolates (mostly chocolate noir) from all over the world.
Up the Rhein, you'll find the Schokoladenmuseum. As the name allready says, they show you the history and the making of chocolate.
Not bad, but you shouldn't go there hungry.... trust me!