In the 1940s New York was the crucible for post-war American and European art, and at the heart of this was Peggy Guggenheim and her remarkable museum/gallery, made instantly the most sensational venue of the avant garde in New York by Frederick Kiesler's visionary architectural design. This is the never-before-written story of "Art of This Century"--the name Guggenheim gave to both her collection (now part of the Solomon R. Guggenheim Foundation...