I recently went to Ulm to have a look at the newly inscribed Ice Age sites, and I picked the Vogelherd and Hohle Fels caves as the ones easiest to reach by public transport. Both can be done in a day (I went on a Sunday in summer), but because there are only 3 daily buses to Vogelherd (from the train station in Niederstotzingen), I could not visit the museum in Blaubeuren, as I had originally planned. The Vogelherd cave is part of the Archaeopark, a nice little museum/visitor centre/archaeological event centre. A relatively short walking path takes you to the actual cave, which is really quite small and open to the elements - hard to imagine how people back then would have survived a strong winter. In the afternoon, I took the train (via Ulm) to Schelklingen, from where it is about a 25-minute walk to the entrance of the Hohle Fels cave. There is a small exhibition at the entrance, and the actual cave is really quite big and impressive - to me, a real cave compared to Vogelherd, which just seemed to be an opening in the rock. You can walk all the way to the far upper end, it's just a bit slippery inside. Because I had no time for the museum on this or the following day (it is closed on Mondays), I thought that I had learned more about caves than about the actual cave art, but it was still an enjoyable day. Ulm is by the way a very pretty town that is worth a stay, especially for the Minster, which has the highest spire in the world and is the largest Protestant church in Germany.