International Airport Jeddah in Saudi Arabia by OMA

Every year, two million pilgrims visit Mecca, the holy city of the Islamic world. During the 33-day period of Al Ḥajj (the fifth pillar of Islam, during which every Muslim who can afford it is required to make a pilgrimage to Mecca), the local airport experiences its main influx of pilgrims. Rem Koolhaas, who has successfully infiltrated Communist China and among oil sheikhs in the Middle East, established four postulates for this specific task: forecasting is before uncertainty, arrival is followed by departure, the center is before linearity, and the special is before the general. While a regular airport places greater emphasis on its spaces in the departure halls, this moment is insignificant in Mecca. Everyone primarily comes to Mecca.
Koolhaas's project consists of two circular buildings, with the smaller one representing a separate airport for the Saudi royal family. In the inner circles are oases with various contents and functions. The design integrates Al Hajj and a conventional airport, which could retain its "normal" size: both arrival and departure operations occur on the same level. Thus, both functions are equivalent. A whole level has been left free and is only opened during All Ḥajj. Link>