Aedicula, small shrine
Aisle, a space for walking with rows of seats on either side
Alfiz, rectangular frame around an arch
Ante-fixae, ornament at the eaves of a building covering the ends of the joint tiles of the roof
Arcade, passage or walkway covered over by a succession of arches or vaults supported by columns.
Arch, opening in a building that is curved on top.
Arcosolium, arched recess used as a burial place in a catacomb.
Arris, the sharp edge formed by the intersection of two surfaces
Ashlar, dressed stone work of any type of stone.
Atlas, a support sculpted in the form of a man, which may take the place of a column, a pier or a pilaster
Atrium, a large open space, often several stories high and having a glazed roof and/or large windows
Attic, a space found directly below the pitched roof of a house
Ball flower, an architectural ornament in the form of a ball inserted in the cup of a flower
Baluster, a moulded shaft standing on a unifying footing and supporting the coping of a parapet or the handrail of a staircase.
Balcony, a platform projecting from the wall of a building, supported by columns or console brackets, and enclosed with a balustrade
Barrel vault, an architectural element formed by the extrusion of a single curve (or pair of curves, in the case of a pointed barrel vault) along a given distance
Battlement, a low wall around the top of a castle, or wall with gaps for shooting through
Bay, the distance between two supports of a vault or the unit of an opening and its framing on a façade
Blind arcade, an arcade that is composed of a series of arches that has no actual openings and that is applied to the surface of a wall as a decorative element
Bossage, a stone in a building, left rough and projecting.
Cable railings. Safety rails that use horizontal or vertical cables in place of spindles, glass, mesh etc. for infill.
Camber beam. A piece of timber cut archwise, or with an obtuse angle in the middle, commonly used in platforms, as church leads, and other occasions where long and strong beams are required.
Hypogeum. An underground temple or tomb.
Matroneum. A gallery on the interior of a building, originally intended to accommodate women. In medieval churches matronea became purely architectonic elements, placed over the side aisles. In Early Gothic churches the matronea were one of the four elements which constituted the interior walls (arch, matroneum, triforium and clerestory). (images)
Pergola. A garden feature forming a shaded walk or passageway of pillars that support cross-beams and a sturdy open lattice, upon which woody vines are trained.
Porch. A structure attached to a building, forming a covered entrance to a vestibule or doorway.
Portico. A porch leading to the entrance of a building, or extended as a colonnade, with a roof structure over a walkway, supported by columns or enclosed by walls.