The Barcelona Pavilion, designed by Ludwig Mies van der Rohe and Lilly Reich for the 1929 International Exposition, stands as a milestone in modern architecture. Renowned for its minimalist design, innovative use of materials, and the seamless blending of interior and exterior spaces, the pavilion is a masterclass in structural and spatial clarity. This article explores the key structural elements of the Barcelona Pavilion, focusing on the unique features that make it an enduring icon and a foundational work in the study of modernist architecture.