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Coastal artillery site Castillitos— Cartagena, Spain. It was built together with the coastal artillery Cenizas in order to protect the entrance to the Bay of Cartagena in the Mediterranean Sea
(upload.wikimedia.org)
Wikimedia Commons picture of the day for May 1.
The construction took place between 1933 and 1936 following a project from 1926 during the dictatorship of Primo de Rivera. It's a Spanish National Heritage Monument since 1985.
