If your trip to Plankstadt is all sorted out but your itinerary is looking a little empty, let us give you a few hints and tips.Think of Plankstadt and then say the first thing that pops into your brain. You probably said “Heidelberg Castle,” right? Being such a famous landmark, you can’t miss seeing it. Toss your luggage into the trunk and check it off your bucket list.Nothing’s better than discovering new things, and you can do that at Schwetzingen Castle. Church of the Holy Spirit is another interesting detour.