From Italian for "round", it's a large & high circular hall in a building, usually surmounted by a dome
.... a church building, usually facing east, with a tall main nave and two or 
four side... [DOC] [TLE] Romanesque architecture - New World Encyclopedia [PAR] Jul 17, 2015 ... 4 A Monumental Style: Romanesque Architecture at its Best ... in the Byzantine 
Empire where the building of masonry domes and the ..... is set into a large 
arched recess and surmounted by a semi-circular .... on the towers of Italian 
churches, which are usually built of brick and may have no other ornament.