Submerged fort of San Matías rediscovered in Cartagena Bay, Colombia
Built in 1567 by Governor Pedro de Acuña on a sandbank at Cartagena Bay, the Fort of San Matías protected the city from pirate and privateer attacks.
Facade of Castillo San Felipe de Barajas in Cartagena, Colombia.(photo credit: Ute Sonja Medley. Via Shutterstock)