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The Parc des Buttes Chaumont in north-eastern Paris, with the Belvedere of Sybil on the rocky peak at the left, and a bridge on the right, circa 1900. A former quarry, the area was redeveloped and opened as a park in 1867. (Photo by Galerie Bilderwelt/Getty Images)

The Parc des Buttes Chaumont in north-eastern Paris, with the Belvedere of Sybil on the rocky peak at the left, and a bridge on the right, circa 1900. A former quarry, the area was redeveloped and opened as a park in 1867. (Photo by Galerie Bilderwelt/Getty Images)