Mackintosh designed the Glasgow School of Art in two phases. This archival photo from the GSA’s collection shows it after completion of the second phase.

Although it met with mixed reviews upon its completion in 1909, Mackintosh’s design for the Glasgow School of Art is now generally regarded as his masterpiece. Built in two phases, it bookends the peak of his creativity. Today later construction has crowded the building, so it is interesting to see it captured, as in this photo from the School’s archive, in its original context.