The works of Leonardo da Vinci in craftsmanship and science have been widely acknowledged; however, his contributions to the field of engineering are often overlooked. This paper aims to address a notable gap in the literature by examining Leonardo's architectural blueprints and examining how he integrates the domains of craftsmanship, engineering, and design. This paper presents a comprehensive analysis of six notable architectural designs by Leonardo da Vinci, which include a fortification exhibiting concentric rings, a mountain fortress, the proposed city of Romarantin, the dual helix staircase of Chateau de Chambord, the winding staircase of Chateau de Blois, and the concept of an ideal city. Each case study meticulously examines Leonardo's ability to integrate artistry, engineering, and architecture into his designs, encompassing his manipulation of perspective, chiaroscuro, proportion, harmony, and symmetry. It provides a comprehensive examination of the integrator theme present in the structural designs crafted by Leonardo. The research approach employed in this study involved a subjective investigative design, incorporating both primary and secondary sources, including Leonardo's original drawings and notebooks, scholarly articles, and publications. The paper ultimately presents experiential accounts that align with current architectural practices and contribute to a more profound comprehension of Leonardo's design principles. The findings suggest the potential for enhanced architectural planning and improved outcomes.