Oxford Art Online
Excellent survey articles on major art and architecture movements (International Style), institutions (Bauhaus, CIAM), the art and architecture of countries and regions, and the life and work of individual artists and architects (e.g., Zaha Hadid, Walter Gropius, Jean Nouvel), building materials and techniques. Entries for individuals include biographical, critical, and contextual information. Each article is supplemented by a bibliography of major primary and secondary sources. Many articles include links to good digital images.