A common architecture for churches is the shape of a cross.

These churches also often have a dome or other large vaulted space in the interior to represent or draw attention to the heavens.

Other common shapes for churches include a circle, to represent eternity, or an octagon or similar star shape, to represent the church's bringing light to the world.

Another common feature is the spire, a tall tower on the "west" end of the church or over the crossing.