The most common word for this is "edifice," meaning "a building, especially a large and imposing one." The word edifice is also used to refer to a complex belief system, often large and imposing in their own ways.
edifice
michelle ezeobi
1. A building, especially one of imposing appearance or size.2. An elaborate conceptual structure(http://www.thefreedictionary.com/edifice)
Wapati
Mediterranean Sea
Prushotam
Katydid
Tome.
Australia
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spacioussizablesubstantialsuper-sized
The Council Edifice is where the Council of Guardians meet to make important decisions in Lois Lowry's novel, "Gathering Blue." It is a large, imposing building that serves as the center of power in the village.