Mamula Fortress, also known as Fortín De Lastavica, is a historic Austro-Hungarian fortress located on Mamula Island, offering panoramic views of the Adriatic Sea. Access to the island is primarily by boat, and accessibility on the island itself may be limited due to the fortress's structure. Visiting solo is possible if you have your own boat or can arrange transportation, but guided tours often provide historical context. There may be seasonal restrictions on boat trips depending on weather conditions. A boat tour could cost around €20-€50, and a typical visit lasts 1-3 hours. The fortress has a dark history, as it was used as a concentration camp during World War II, which should be considered when visiting.