Casino-Cultural Athenaeum of Mazarrón Monument · Mazarrón, Bajo Guadalentín, Murcia The Casino-Ateneo Cultural of Mazarrón is a building of eclectic architecture already documented in 1844, whose exact construction date is unknown. In the 1880s it began operating as a casino, having previously served the social and cultural life of the municipality, a role it kept throughout the 19th and 20th centuries. Photo: Yolanda95 (CC BY-SA 4.0) What to see and do in Mazarrón