When you arrive, the facade of the caves is not the most modern of appealing but the inside of the caves is beautiful. Although it said on the website that it was open from 11am-4pm with tours leaving every hour, we arrived at 11am on a Saturday to find that tours were only running at 1pm, 2pm and 3pm that day so we returned later. The tour guide split the group up so that the Dutch speakers were at the front, the French in the middle and the English at the back of the line. This meant that during the tour, he moved along the line to talk to each group separately and tell us all the information about the caves. The guide was enthusiastic, informative and tried to keep a good rapport with the group but may have scared a few children due to his over-enthusiasm! The caves are beautiful inside and worth visiting!