| Clipper Williams, from Denver, Colorado looks at ice formations at the Ice Castles at Silverthorne in Colorado Jan 3, 2012. The Ice Castles at Silverthorne consists of man-made walkways, tunnels, and arches of ice with no supporting structures, some reaching up to a height of 30 to 40 feet (9 to 12 metres). These formations are illuminated at night by 200 compact florescent lights.(Photo/Agencies) |