Postcard Riddle

The following three postcards were presented to me by a collector. These are black and white photographs printed on a photo cardboard with postcard lines on the back. This was common at the beginning of the 20th century. One of the three cards has run, all three most likely originate either in Southern Germany or in the Northern Limestone Alps. The question that now arises is, which speleologists are depicted on it and which caves? This page was created with the hope that cave explorers who research in southern Germany will recognize the entrances.

postcard 1.
postcard 2.
postcard 3.