ARCHITECTURE. [This article presents a thematic overview of religious architecture. Monuments associated with prehistoric religious practices are discussed in Megalithic Religion; Paleolithic Religion; and Prehistoric Religions.]

Architecture may be defined as the art of building, and consequently religious architecture refers to those buildings planned to serve religious purposes. These structures can be either very simple or highly complex. They can take the form of a circle of upright stones (megaliths) defining a sacred space or they may spread over acres like the sanctuary at Angkor Wat. They can be of any and every material from the mounds of earth reared over royal tombs to the reinforced concrete and glass of twentieth-century houses of worship.

Yet the practice of religion does not of itself require an architectural setting. Sacrifice can be offered to the gods in the open air on a hilltop; the adherents of Islam can perform their...