BARCELONA PAVILION
Mies van der Rohe and Lilly Reich were jointly responsible for the design of the German section of the 1929 International Exposition at Barcelona. In addition to being open to the general public, this pavilion would accommodate the inaugural ceremonies of the exposition's German section (attended by King and Queen of Spain) and be used for numerous government receptions. It was an important building in the history of modern architecture, known for its simple form and extravagant materials, such as marble and travertine. Several critics and historians have declared it "the most beautiful building of the century".

The site selected was crossed by one of the exposition's walking routes. By allowing this path to continue uninterrupted through the spaces of his building, Mies van der Rohe underlined the open character of those spaces and eased the transition between the exterior and interior.

The pavilion consisted of two horizontal planes: the smaller- forming the roof, being held above the larger- forming a raised terrace, by cruciform shaped steel columns. Freely placed between these two planes were non-load-bearing walls of marble and glass; some extending beyond the roof plane to enclose and articulate exterior spaces.

The richness of the materials used in the pavilion: the marble and onyx walls, the travertine-faced podium, the tinted glass and the chromium-plated column covers with the attendant transparency quently blinded critics to the significant architectural values of this work.

At Barcelona mies van der Rohe brought his ideas on structure and space to a remarkable synthesis. From horizontal and vertical planes, opaque and transparent materials and skeletal construction, he created a building of great poetic feeling, whose position in terms of architectural development is undeniably that of a seminal work.