Odderøya island has played several important roles throughout history. It served as a central location for military protection of the city from 1667 to 1999. During the 19th century, it operated a signal station and battery with 10 cannons. It was also a key site for quarantining infectious diseases like cholera in the 1800s. Today, Odderøya island is known for its natural beauty, cultural activities center, and festivals that attract up to 20,000 people to its amphitheater. It remains a popular recreation area for residents and visitors to enjoy in all seasons.