Caves of Han-sur-Lesse

The Caves of Han-sur-Lesse (in French: Grottes de Han-sur-Lesse or simply Grottes de Han) are a major Belgian tourist attraction (around half a million visitors per year) located on the outskirts of the village of Han-sur-Lesse.

The caves are the result of the underground erosion of a limestone hill by the river Lesse. The river forces its way under the hill over a distance of over 1 kilometer (12 mi) as the crow flies. The caves have a constant temperature of 13 °C (55 °F) and a high level of humidity. Access is only possible via a vintage streetcar, a remnant of the country's once extensive vicinal tramway system, which departs from the center of Han-sur-Lesse. The entry to the caves is about 2 km (1 14 mi) from the village. The guided tour takes about an hour to an hour and a half and includes a sound and light show in one of the largest chambers of the cave and an ending with a cannon shot to demonstrate the cave's acoustic properties.

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Coordinates: 50°7.1′N 5°11.43′E / 50.1183°N 5.19050°E