[3][4] Following the establishment of the religion in 1926, 96 acres of forested land at Bau Ca Na in Long Thanh hamlet, previously owned by a Frenchman called Aspar, was acquired for the construction of the Holy See.

[9] The Holy See complex consists of the central Great Divine Temple, the main administrative offices, residences for high officials and adepts working on the grounds, and other major facilities.

The ground floor of this connecting structure, immediately behind the main entrance, is known as Tịnh Tâm Điện.

[3] The last part of the Great Divine Temple is the Bát Quái Đài, which consists of a high octagonal-shaped tower.

In Caodaist tradition, this is the place of Đức chí Tôn (Jade Emperor), Saints, Buddha, and Fairies.

The eight sides of Bát Quái Đài correspond to a part of Bagua, including Qian, Dui, Li, Zhen, Xun, Kan, Gen, Kun.