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Why Did the Floor of a Spanish Monastery Turn Blood Red Once a Year for Almost 500 Years?

Courtesy photoThe community of Trappist monks of the monastery of San Pedro de Cardeña in Burgos, Spain.

The looting of the monastery and killing of the monks out of hatred for the faith was recorded in the General Chronicle of Alfonso X the Wise, the first large-format history of Spain written directly in Castilian Spanish at the end of the 13th century.