This is the study of how buildings and other important structures are designed. You may not know the nuts and bolts of construction outside of building codes, but you can envision and analyze existing designs. At the highest level, you are familiar with the design techniques of many cultures and know how to combine them effectively for a given environment.
In ancient times, you would be accustomed to the designs and techniques used locally, familiar with stone supports and obsidian tools. You know how to haul massive stones up great heights with pulley systems. With a high level in architecture and a background in engineering, your buildings are detailed and glorious as if guided by the hands of Gods.
Nowadays, high levels in Architecture lends itself to the building of megastructures. The tallest and most impossible skyscrapers can be modeled with a computer. You'll also likely have Visual Arts and a background in landscaping and decor. The future will bring impossible materials and stunning advancements into the mix.