Architecture is most concerned with the physical, built environment.
The profession of designing buildings, open areas, communities, and other artificial constructions and environments, usually with some regard to aesthetic effect. Architecture often includes design or selection of furnishings and decorations, supervision of construction work, and the examination, restoration, or remodeling of existing buildings. (dictionary.com)
Architecture doesn’t have to be a “fancy” building or designed by a world-renowned designer. It just has to meet a defined need, and for architecture, that need requires a built environment. Here’s a basic overview: What is Architecture?.