Prison Island Zanzibar, also known as Changuu Island, is a popular tourist attraction known for its historic prison buildings, beautiful beaches, and giant tortoises. Originally intended as a prison for rebellious slaves, the island is now a peaceful getaway offering snorkeling and swimming opportunities in turquoise waters. Visitors can learn about the island's history, enjoy scenic views, and experience the unique wildlife of the giant tortoises, some of which are over 100 years old.