Saint-Christophe Caves, Natural cave system in Chartreuse Valley, France.
The Saint-Christophe Caves consist of two separate limestone caves in the Chartreuse massif. The Upper Cave holds a geological formation of giant's kettles and is still reached by underground water; its mapped length was 1,377 m in 2012. The Lower Cave, 215 m long, is crossed by a metal walkway fixed to the rock 5 to 25 m above the floor, giving a view over the Échelles valley.
Water carved these limestone chambers during the Ice Age as layers formed gradually over geological time. People visited the caves in prehistoric times, leaving traces of their presence in different periods.
The name Voie sarde comes from the Dukes of Savoy, later kings of Sardinia, who in the 17th century turned this ancient passage into a royal road for stagecoaches. A monument to Charles Emmanuel II of Savoy, erected in 1674 and listed as a historic monument in 1952, stands just before the cave entrance.
A visit requires proper footwear and patience with narrow passages in some sections. Bring a light jacket since the temperature stays cool year-round inside.
The lower cave, 215 metres long, is crossed by a metal walkway fixed to the rock between 5 and 25 metres above the floor, giving a view over the Vallée des Échelles. The upper cave, 1,377 metres long in 2012, is still shaped by underground water and holds giant's kettles.
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