Over the past three decades, Arthur and Cynthia Wood turned their four-story home into a work of art. They purchased the brick tenement at the intersection of Downing and Quincy streets in 1979 for $2,100 in cash. Courtesy of Chris Wood hide caption

itoggle caption Courtesy of Chris Wood

Restorer Nicoletta Rinaldi works on the ceiling of the Hall of Mirrors at the Versailles Palace, west of Paris, in 2007. Remy de la Mauviniere/AP hide caption

itoggle caption Remy de la Mauviniere/AP

"Beauty is not just for the imagination. It's actually a way of altering human behavior for the better." — Bill Strickland TED hide caption

itoggle caption TED

Leap into the Void, 1960 (Yves Klein, Harry Shunk and Jean Kender) The Metropolitan Museum of Art/Courtesy of the National Gallery of Art hide caption

itoggle caption The Metropolitan Museum of Art/Courtesy of the National Gallery of Art

The bucardo, or Pyrenean ibex, lived high in the Pyrenees until its extinction in 2000. Three years later, researchers attempted to clone Celia, the last bucardo. The clone died minutes after birth. Taxidermic specimen, Regional Government of Aragon, Spain Robb Kendrick/National Geographic hide caption

itoggle caption Robb Kendrick/National Geographic