Castillo San Felipe De Barajas is one of the main attractions in #Cartagena . It is the largest and strongest ever built by the Spanish outside of Spain. Its fortifications are connected through a set of underground tunnels. How did you like it? https://backpackandsnorkel.com/Cartagena/ https://s3.eu-central-2.wasabisys.com/mastodonworld/media_attachments/files/111/167/920/045/529/018/original/57d953b76f0b93e7.jpeg