When I was a child, my TV consume was not very great - but there were a few shows I enjoyed a lot, and watched quite often. One of them was "Die Sendung mit der Maus". The show is still running (the Mouse has turned 40 in 2011) and is still loved and appreciated by children... and adults.

Here is a snippet of it where they explain why the city Mannheim is called Mannheim. In German, of course... but very nicely.