The various palaces in this area with an oasis and the Najdi architectural and decorative style was one of the UNESCO criteria to list the district as a World Heritage site. Moreover, The Al-Turaif District was the first historical center with a unifying power in the Arabian Peninsula. As in the mid-18th century, Al-Dir'iyah became the capital of an independent Arab State representing an important phase in the human settlement of the central Arabian peninsula.