This portfolio provides a detailed overview of architectural history and theory in the built environment. It begins with an introduction to architectural history, followed by explorations of architectural styles from Ancient Egypt, Greece, and Rome, to Early Christian and Byzantine, Medieval to Romanesque, Gothic, Renaissance, Baroque, and 18th and 19th-century architecture. The portfolio also includes a section on colonial and indigenous architectures in Australia, concluding with a summary of the history in the built environment and a list of references. The document covers key architectural movements, significant structures, and cultural influences across different historical periods, providing a comprehensive understanding of the evolution of architectural design and its connection to social and cultural contexts. The portfolio includes illustrations and analyses of iconic buildings and architectural styles, making it a valuable resource for students studying architectural history.