Bahla Fort is located at the foot of the Jabel Akhdar mountains and is a UNESCO world heritage site. The fort is a superb example of Islamic mediaeval fort design, its sand colouring blending perfectly into the natural landscape. Said to be built between the 12th and 15th centuries by the Banu Nebhan tribe who occupied this area, and controlled the sale of frankincense. There are three main parts inside the fort. The oldest part of the fort is Al-Qasabah. Bait al-Hadith, or new house, was built by the Ya’riba dynasty (1624-1743). Bait Al-Jabal was erected in the 18th century.