The Brother Grimm (Jacob and Wilhelm to their mother) are world-famous, arguably the most well known of all Kassel’s people. The siblings produced fairytales that have stood the test of time, have been translated into over 170 languages and have been printed more than a billion times, to the point where there really is little point in keeping count. The two were professionally inseparable, working on a dictionary that took 25 years just to get to the letter F. Think about that for a second. Kassel’s excellent GRIMMWELT centre is a modern walk-in sculpture construction with some seriously good views, but more importantly it explores all things Grimm through engaging and informative exhibitions. German speakers will love insulting the swearword generator — which always comes back at you with a better insult. It's a marvellous place to learn about the Grimm brothers' lives, to see their UNESCO-listed personal reference books scribbled full with notes, and to take in the lovely artworks by painter and sketch artist Ludwig Emil, the third Grimm brother. Set at least two hours aside to enjoy the exhibits without hurrying. The Falada café and the rooftop terrace are open to the public.