Cartagena’s location on the Mediterranean Sea has been a major port since the 2nd century BC. Since the early 18th century, it has also been a strategic site for the Spanish Navy. Construction of the Cartagena Naval Base began in 1731 and was finished fifty years later. The Arsenal de Cartagena operates in the Mediterranean Maritime Zone, one of four area commands of the Spanish Navy. This yellow clock tower is camera worthy. But do not expect to get beyond the front gates. Tourists are restricted from the base.