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Photo: Willem van der Horst, CC BY 2.0 via Wikimedia Commons
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.
The Old Fort, also known as the Arab Fort and by other names, is a fortification located in Stone Town, the capital of Zanzibar. It is the oldest building and a major visitor attraction of Stone Town. It is located on the main seafront, adjacent to another landmark building of the city, the House of Wonders, and facing the Forodhani Gardens.
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"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.
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.
St. Joseph’s Cathedral was built by French missionaries in the late 19th century.
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.
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
A complex of public baths built at the end of the 19th century by Shirazi architects for Sultan Barghash bin Said. These baths are not open anymore but are open to visitors. Visits are limited to some areas of the original complex because part of it (e.g., the restaurant) has since been adapted for private residences