Abstract expressionist artist Helen Frankenthaler, pictured above in 1956, adopted Jackson Pollock's technique of painting canvases laid flat on the floor. She sought to "marry" the paint with the canvas, she said. Gordon Parks/Time Life Pictures/Getty Images hide caption

itoggle caption Gordon Parks/Time Life Pictures/Getty Images

Diego Rivera's fountain of the Aztec rain god Tlaloc is a pumping station in Mexico City's municipal water system. It fell into disrepair for some time, but has recently been restored. David Hiser/National Geographic hide caption

itoggle caption David Hiser/National Geographic

Anthropologist Nicholas Conard (left) and filmmaker Werner Herzog examine artifacts from the Chauvet caves in southern France. Mark Valesella/IFC Films hide caption

itoggle caption Mark Valesella/IFC Films

Woman I (1950-52) is one of the works featured in de Kooning: A Retrospective. The exhibit is on display at the Museum of Modern Art through Jan. 9, 2012. John Wronn/Museum of Modern Art hide caption

itoggle caption John Wronn/Museum of Modern Art

This 1964 Andy Warhol lithograph entitled "Liz" is signed by the artist. It reads, "To Elizabeth with much love" in felt-tip pen. Christie's hide caption

itoggle caption Christie's

Designed in 1958, architect John Lautner's Chemosphere House perches atop a 29-foot concrete pole on a roughly 45 degree slope in California's Hollywood Hills and is accessible via funicular. Sara Sackner/Courtesy of Judith Lautner and the John Lautner Foundation hide caption

itoggle caption Sara Sackner/Courtesy of Judith Lautner and the John Lautner Foundation