The Cave That a Little Girl Found

In 1868, near the market town of Santillana del Mar in Cantabria, a local tiler named Modesto Cubillas noticed that a fallen tree had disturbed a pile of rocks, exposing an opening into the hillside of Mount Vispieres. What he had found was the mouth of a cave that had lain sealed for roughly thirteen thousand years, ever since a rockfall closed it off and preserved everything within.

Eleven years later, in 1879, an amateur archaeologist named Marcelino Sanz de Sautuola was exploring the cave when his eight-year-old daughter María looked up at the ceiling and saw what he had missed: vivid animal figures painted directly onto the stone. Sautuola realized these were not decorations from his own era. He teamed up with Juan Vilanova y Piera of the University of Madrid, and together they excavated the site and published their findings in 1880, arguing that the paintings dated to the Paleolithic.

The response was, at first, enthusiastic acclaim. But the mood shifted quickly. French specialists, led by Gabriel de Mortillet and Émile Cartailhac, refused to accept that prehistoric humans could have produced such sophisticated art. At the 1880 Prehistorical Congress in Lisbon, Sautuola and Piera's conclusions were openly ridiculed. Critics accused Sautuola of forgery, pointing out that the cave walls and ceilings bore no soot marks — strange, they argued, for paintings supposedly made by firelight. Sautuola later proposed that the ancient artists had burned marrow fat rather than other fuels, which would have produced far less soot.

The dispute dragged on for over two decades. Sautuola died in 1888, fourteen years before the scientific world reversed its judgment. Vindication finally came in 1902, as similar prehistoric paintings turned up elsewhere across the Franco-Cantabrian region, making the case for Altamira's antiquity impossible to dismiss. That year, Émile Cartailhac published a startlingly honest retraction in the journal L'Anthropologie titled 'Mea culpa d'un sceptique' — the confession of a skeptic.

Cartailhac went on to co-write books about the cave, working with Henri Breuil, a Catholic priest and skilled draughtsman who produced hand-drawn reproductions of the paintings. Further excavations followed over the twentieth century: Hermilio Alcalde del Río between 1902 and 1904, Hugo Obermaier between 1924 and 1925, and Joaquín González Echegaray in 1968, each adding to the archaeological record.