Soffit
soffit
A battlement.
The columns
Barrell vaults
I must admit it's a big question. Architectural features can be found in the domains of aesthetics, construction and functionality. Examples: A column has a constructional purpose: it holds the building A mosaic on a ceiling, voluts and finish of materials contribute to the buildings aesthetics. Hospitals has got a high degree of functionality to make sure it's efficient. The degree to which these three areas are covered in a building is varying in a way that suits the needs. The architectural feature can be any part of a building. Of course a corner of a wall isn't necessarily the most interesting thing to look at, but if it's fitted to the floor in a special way, you could call it an architectural feature.
The architectural term is "vault"; some call it a cathedral ceiling.
soffit, an architectural feature
The major architectural feature of the Colosseum and other Roman buildings was the use of concrete.
A battlement.
The columns
Barrell vaults
The columns
a ballcourt
Those letters spell gargoyles, an architectural feature.
A breezeway is a type of architectural feature that allows a breeze to cross through the hallway. This may be for aesthetic purposes or for functional purposes by creating a cooling breeze for travelers crossing the breezeway.
The arch and the column.
The columns - Doric, Ionian, Corinthian.
NO, THEY ALWAYS have a call feature.