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In page Grotte des Demoiselles:
"At various times in history the cave has also served as a hiding place and refuge. An early explorer of the cave was the composer Benoît-Joseph Marsollier in July 1780. In 1889, more serious exploration of the cave was undertaken by the renowned speleologist Édouard-Alfred Martel. At the time, visiting the cave was quite perilous, but in 1931 a funicular, concrete stairs and walkways with sturdy railings and extensive electric lighting were installed to make it accessible to the general public; and since then it has been a popular regional tourist attraction.
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