In Autumn/Winter I'll be going back to Germany for a few days, more specifically to visit Berlin and Sylt. Whilst train tickets aren't on sale yet, plane tickets are, so I'll be looking to book by next month.
Is there anywhere near/inbetween the aforementioned cities that anyone would recommend for a day visit? Bonus points if the rail line to/from it is particularly scenic
TIA
Is there anywhere near/inbetween the aforementioned cities that anyone would recommend for a day visit? Bonus points if the rail line to/from it is particularly scenic

TIA