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Visitors take pictures with the installation 'The sky over nine columns' by German artist Heinz Mack framing St. Mark's bell tower, in the background, in Venice, Italy, Wednesday, June 4, 2014. The installation, part of the 2014 Venice Biennale of Architecture, features nine 7.5 meter-high (24.6 ft) symmetrically arranged columns covered with golden mosaic. (AP Photo/Domenico Stinellis)