There are currently seven Baha'i Houses of Worship in the world. Each temple has its own distinctive design, and yet conforms to a set of architectural requirements that give a unifying theme. All Baha'i Houses of Worship must have nine sides and a central dome.
Construction of the Baha'i House of Worship for the North American Continent in Wilmette, Ill. was completed in 1953. On the lower level of the House of Worship is Foundation Hall (the oldest part of the temple) and the Cornerstone Room, which contains the cornerstone laid by Abdu'l-Baha in 1912. The auditorium features walls of lace-like ornamentation and a dome rising 135 feet above the main floor.