Dia's first major projects, undertaken in the late 1970s, were site-specific works by artists such as Walter De Maria and Max Neuhaus, which were unlikely to be accommodated by conventional museums because of their nature or scale. Today, Dia owns a large and important collection of pop art, minimal art, conceptual art and land art that has been exhibited at the Dia:Beacon museum in the Hudson Valley north of New York City since 2003. Dia also organizes temporary exhibitions, lectures and discussions about contemporary art.