King Abdulaziz Palace in Al-Seih is among the most important historical palaces in the Kingdom of Saudi Arabia, which was built in 1359 Hijri corresponding to 1940. The palace, located in Al-Aziziyyah neighborhood in the center of Al-Seih City, comprises identical architectural units in terms of design, building materials and the number of floors, and was constructed on the modern Islamic style with stones covered with a layer of gypsum, where the length of each square unit is 30 meters. Each unit has two floors, the first is known for rectangular openings for natural lights in the upper third of the external walls, where each opening is facing a big window on the lower third of the second floor with an area of 70*150 centimeters, where the shape has added further beauty to the building whose doors have plant mosaics. The palace was constructed over two stages, where the western palace was built in the first phase and was allocated to receiving official delegations and guests of the late King Abdulaziz, while the second stage included constructing the eastern palace with its external walls and a 160-meter-long bridge allocated for the king's car, leading to the upper floor of the palace that was allocated for the residency of King Abdulaziz and his family. The palace is currently under the supervision of the Heritage Commission that seeks to rehabilitate the palace and develop its facilities, especially for its being one of the most important palaces in the world. Al-Seih City is the capital of Al-Kharj and its administrative and economic center, and was established after the unification of the Kingdom of Saudi Arabia by the late King Abdulaziz. The city is witnessing development processes thanks to its investment-attractive economic features. The city also hosts several important economic and government facilities. — SPA