Unguja, also known as Zanzibar Island, is the main island in the Tanzanian archipelago of Zanzibar. Stone Town, part of Zanzibar City, is an old trade center, with mosques and winding lanes. The 1883 House of Wonders is a former sultan’s palace with a clock tower. The Old Fort now houses a cultural center and a stone amphitheater. Underground aqueducts fed hot water to the late-19th-century Hamamni Persian Baths. A cluster of islands off of Africa's east coast, Zanzibar is home to beautiful white-sand beaches with sapphire waters, a rich history, and even hidden rainforests. It's popular for honeymooners who want to couple a safari in mainland Tanzania with a relaxing beach getaway.