guided tours: Jul-Aug 9.30am-5.30pm, every 30min; rest of year, times vary greatly, check ahead - closed mid Nov-mid Feb except school hols
This giant limestone cave hollowed out by the Lesse (over 15 km) served as a refuge from the late Neolithic period to the 18C. It has huge concretions (5m-long Minaret Stalagmite) and magnificent galleries: the Salle des Mystérieuses (crystal palace); the Salle d'Armes, which the Lesse runs through and he setting for a sound and light show; the Salle du Dôme, where you see a torch-bearer shoot down the enormous chamber. Boats take visitors back to daylight at the Trou de Han.
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