The Trollkirka is no ordinary church, but a cave made of marble and limestone, where an underground river flows and a waterfall provides spectacle.

You follow a 1.5-hour hiking route to Trollkirka. This is a tough route that requires good shoes and a good level of fitness. This is because the route goes uphill on a path full of rocks. The cave is in the middle of the mountains and is 70 metres long. At the end of the cave is the waterfall that comes down into a white marble bowl. Beyond the cave is a lake where you can swim.

You park at the RV64 and follow the signs to Trollkirka. This is about a two-hour drive from the flats. Bring a torch or headlamp! It is pitch-black in the cave, without a lamp the still is not doable. We did it using our phone because we had left the lamp in the car. That's asking for trouble given the uneven ground. Inside the cave, there is the necessary scrambling, and it is really incredibly exciting.