basilica - an early Christian church designed like a Roman basilica; or a Roman Catholic church or cathedral accorded certain privileges; "the church was raised to the rank of basilica"

portico - a porch or entrance to a building consisting of a covered and often columned area

antechamber, anteroom, entrance hall, foyer, lobby, vestibule, hall - a large entrance or reception room or area

church building, church - a place for public (especially Christian) worship; "the church was empty"