Show up at At-Turaif without a ticket and staff will turn you around at the footbridge. That single fact should shape how anyone plans a Riyadh Province attractions itinerary: some sites are free and walk-up, one headline site is booking-only, and the desert excursions run on a completely different clock. The pass you cannot buy at the gate At-Turaif, the UNESCO-listed 18th-century mud-brick citadel in Diriyah, only admits visitors who have reserved a slot online through the official Diriyah portal (diriyah.