arches

Example:The high vaults inside the cathedral display intricate carvings and paintings.

Definition:compartments beneath the floor or ceiling of a building or roof, especially of a church or arcade; a structure resembling a vault or a part of one.

Example:The domes of the observatory serve not only as a shelter but also as a structure to guide the stars.

Definition:a hemispherical or hemicylindrical roof, as in a building.