These overgrown but worthwhile ruins include the remnants of a late 15th-century mosque as well as Arabic graves from the 18th or 19th centuries, with some well-preserved pillar tombs plus some more recent graves. Fragments of Chinese pottery found here testify to ancient trading links between this part of Africa and Asia. Arrange a guide with your hotel, and expect to pay from about Tsh20,000 for the excursion including entry fee. It's not safe to go alone.