Fuerte de San Fernando & Batería de San José
On the southern tip of the Isla de Tierrabomba, at the entrance to the Bahía de Cartagena through the Bocachica strait, lies Fuerte de San Fernando. This fort together with Batería de San José on the opposite side of the strait once guarded access to the bay. A heavy chain was strung between the two forts to prevent surprise attacks in the 1700s.
Islas del Rosario
This archipelago, about 35km southwest of Cartagena, consists of 27 small coral islands, including some tiny islets. The archipelago is surrounded by coral reefs, where the color of the sea ranges from turquoise to purple. The whole area has been declared a national park, the PNN Corales del Rosario y San Bernardo.