The historical center of the capital is the Stone City - the old part of Zanzibar on the UNESCO World Heritage List.

An excerpt from the article 24 facts about Zanzibar

The city's architecture is a mixture of Arab, Indian, European, and African cultures. Characteristic are the narrow streets that do not accommodate cars. Transport takes place on foot, on bicycles, or on motorcycles. The walking trail leads through the Palace Museum, which was once the residence of the Sultan of Zanzibar. You can find the tombs of all the island's previous rulers there. Noteworthy are the House of Wonders with a built-in clock tower and an old Arab fort built in the 17th century. Also interesting is the so-called Zanzibar's milestone, a marble pillar with distances to the most important places on the island.