On Sunday, 4th October, 25 Swiss castles will open their gates and drawbridges for the 5th National Castles Day.
Agreed by the organizers of this action day, Wikimedia CH and the Swiss OpenStreetMap Association (SOSM) will complement the event with a Swiss Castles and Fortress Day. We will present a map with selected sites of fortresses. There will be also a photo challenge to upload missing photos.
Read more about this offer and the map service.