Spire
Videos
A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires are typically made of stonework or brickwork, or else of timber structures with metal cladding, ceramic tiling, roof shingles, or slates on the exterior.
The Burj Khalifa holds the record of the tallest spire in the world, with the height of 244 m (801 ft)
The Chrysler Building was the first skyscraper with a spire in the world.
Spire of Salisbury Cathedral (completed 1320) (404 feet (123 metres), with tower and spire)
Dormer
Videos
A dormer is a roofed structure, often containing a window, that projects vertically beyond the plane of a pitched roof. A dormer window is a form of roof window.
Dormer window of the Building of Préfecture de police de Paris (île de la Cité)
Gable dormers at Hospices de Beaune in Beaune, France
Pair of hip roof dormer windows on the Howard Memorial Hall, Letchworth
Gable fronted dormer (shallow instance wholly glazed)