Caving is a great activity to do on a rainy day. A 40 minute drive (from Lom) through beautiful nature gets you to the lush valley Dumdalen. A stroll in easy terrain takes you to the cave system – not all of the entries are easy to spot, so keep your eyes open!
The calcareous ground creates conditions for an extraordinary floristic diversity, as well as subterranean labyrinths. These limestone caves were shaped by water washing away the most porous minerals, creating about seven underground tunnels that are large enough to be explored. The river runs in the deepest parts of the caves, and in the light from a head lamp the water vapor looks like crystals. The caves vary in size – some places there are large rooms, other places you'll need to crawl through narrow passageways. One cave is about 250 meters long and goes in a spiral, another one contains a small pond with clear glacial water. The valley of Dumdalen is a distinctive and fascinating place, and well worth a visit even if you prefer to stay overground.
Bringing a guide is not required, but if you don't have any mountaineering experience, I would recommend it – there are several companies in the area that offer tours. This is an awesome activity for everyone who enjoys some easy scrambling and don't mind getting their clothes dirty. Helmet and head lamp is absolutely necessary, and you should also wear a waterproof jacket and good shoes. The caves are dusty, so be sure to protect your camera!