The name above the entrance to the attraction is Gemeentegegrot. These were described as caves but are more like tunnels. They are unlit and the guide leads the visitors with a lantern. Luckily the ground underfoot is mostly flat but it can be a little unnerving if you lag too far behind the guide. The 'caves' have numerous paintings and carvings and each seems to have its own history. Because of the time constraints it wasn't possible to see every painting but to do so would have taken hours. Our guide was excellent and told the story of the caves not only with knowledge but with some humour. If you intend to take photographs make sure you set your camera up before entering the caves as it is too dark to make any adjustments once inside.
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