Barry Bergdoll, The Philip Johnson Chief Curator of Architecture and Design, The Museum of Modern Art, and professor, Columbia University. In the third lecture, originally delivered at the National Gallery of Art on April 21, 2013, architectural historian Barry Bergdoll explores the idea of export architecture and outdoor exhibitions and the development of temporary exhibition pavilions from the world's fair to the open-air museum, including Colonial Williamsburg. The 19th-century debate on national identity as expressed in architectural style is shown to have been advanced by the changing valence of high-style pavilions and redeployed vernacular structures.