Con Dao Prison, also known as Phu Hai Prison, is a historical site that played a significant role during the French colonial era and the Vietnam War. The prison was notorious for its harsh conditions and brutal treatment of political prisoners. Today, it serves as a museum that preserves the memory of the past and honors the sacrifices made by those who fought for independence. Visitors can explore the prison cells, view the exhibits, and learn about the stories of the prisoners. It is a somber and thought-provoking experience that offers a glimpse into the island's tumultuous history.