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Photo: Mangapwani, CC BY-SA 4.0 via Wikimedia Commons
This island used to be a quarantine zone and later a prison. You can visit the prison and observe turtles from the Seychelles that were given as a gift hundred years ago. The oldest one (and the only one originally from the Seychelles) is about 200 years old. The island is private, so you cannot walk any more on the island and relax on the beach, making it less far interesting and to expensive (at least US$37 for just 30 minutes) for what it is.
Changuu Island is an island in the Mjini Magharibi Region, Tanzania, off the coast of Mjini District. It is situated in the Zanzibar Channel. It is located 5.6 km (3.5 mi) northwest of Stone Town. The island is around 800 m (2,600 ft) long and 230 m (750 ft) wide at its broadest point. The island was used as a prison for enslaved people in the 1860s and also functioned as a coral rag mine.
© OpenStreetMap contributors
A small park along the main seawalk of Stone Town, in front of the Old Fort and the House of Wonders. It has been restored by the AKTC. Every evening after sunset the gardens host a popular, tourist-oriented market selling grilled seafood and other Zanzibari recipes.
Built from 1887 to 1894 to serve as a charity hospital for the poor, it was later used as a dispensary. It is one of the most finely decorated buildings of Stone Town, with large carved wooden balconies, stained-glass windows, and neo-classical stucco adornments. After falling into decay in the 1970s and 1980s, the building was accurately restored by the AKTC.
Former Sultan's Palace ("Beit el-Sahel" in Arabic)
Another former sultan's palace, also on the seafront, to the north of the House of Wonders. It was built in late 19th century, and now hosts a museum about the daily life of the Zanzibari royal family, including items that belonged to Sayyida Salme, a former Zanzibar princess that fled to relocate in Europe with her husband
"Palace of Wonders", also known as "Beit-al-Ajaib"
(Closed since 2014 for renovation.) Probably the most well-known landmarks of Stone Town. It was built in 1883 and restored after the Anglo-Zanzibar War of 1896. A former Sultan's residence, it became the seat of the Afro-Shirazi Party after the revolution. It was the first building in Zanzibar to have electricity and the first building in East Africa to have a lift. Since 2000, its interior has been dedicated to a museum on Swahili and Zanzibar culture.
Adjacent to the House of Wonders, is a heavy stone fortress that was built in the 17th century by the Omani. It has a roughly square shape; the internal courtyard is now a cultural centre with shops, workshops, and a small arena where live dance and music shows are held daily.
Near the port, it is dedicated to Freddie Mercury who was born on the island. The only interesting thing in the place is the atmosphere and the nice view over the harbour and bay -- skip the food unless you're in for a stomach ache.