Zwärgliloch, Schnurenloch and Mamilchloch. These are the names of the three caves that cave explorers of all ages are keen to discover. The oldest man-made stone tools in the canton of Bern were once found here. These are on display in the historical museum in Bern. As befits a speleologist, scrambling and climbing ladders are the order of the day on this trail.

The cave trail leads from Oberwil railway station or the cave trail car park to the Gsässgrind rock area, where the three caves Zwärgliloch, Schnurenloch and Mamilchloch are located. The easily accessible Zwärgliloch has a barbecue area with grill, firewood, table and bench. If you bring good shoes, not too nice clothes and a headlamp or torch, you can then set off on the adventurous tour to Schnurenloch and Mamilchloch. The circular route leads along a mountain path, through a natural tunnel and up a ladder into the Schnurenloch. The Mamilchloch (Moon Milk Hole) is reached via a free-standing, approx. 10 metre long ladder. There you can go inside the mountain and, thanks to mystical lighting, take in the side caves and passages. The Schnurenloch was explored with great care by the Andrist brothers from 1928 to 1953. The excavations unearthed over 5000 bone finds, 95% of which could be attributed to the now extinct cave bears. Although no remains of prehistoric humans were found, the oldest man-made stone tools in the canton of Bern were. They can still be seen today in the historical museum in Bern.