1) The document summarizes several important artworks and architectural structures from the early 20th century that were influential in modern art movements. 2) Key works discussed include Fallingwater by Frank Lloyd Wright, the Bauhaus Building by Walter Gropius, the German Pavilion by Mies van der Rohe, and the Villa Savoye by Le Corbusier, which helped establish the International Style of architecture. 3) Important paintings summarized are Picasso's Guernica, which depicted the horrors of war, and Hartley's Portrait of a German Officer, shown at the influential Armory Show in New York.