FILE - This Aug. 6, 2009 file photo shows an artists installation, left, seen with part of the city skyline, right, at the Nasher Sculpture Center in Dallas. The Cultural Landscape Foundation has released a list of 12 threatened or at-risk landscapes. Nasher Sculpture Garden in Dallas _ Construction of a glass skyscraper nearby is casting a shadow over the gardens and disrupting the flow of sunlight into a museum that's part of the site. (AP Photo/Tony Gutierrez, File)

Associated Press
FILE - This Aug. 6, 2009 file photo shows an artists installation, left, seen with part of the city skyline, right, at the Nasher Sculpture Center in Dallas. The Cultural Landscape Foundation has released a list of 12 threatened or at-risk landscapes. Nasher Sculpture Garden in Dallas _ Construction of a glass skyscraper nearby is casting a shadow over the gardens and disrupting the flow of sunlight into a museum that's part of the site.  (AP Photo/Tony Gutierrez, File)
FILE - This Aug. 6, 2009 file photo shows an artists installation, left, seen with part of the city skyline, right, at the Nasher Sculpture Center in Dallas. The Cultural Landscape Foundation has released a list of 12 threatened or at-risk landscapes. Nasher Sculpture Garden in Dallas _ Construction of a glass skyscraper nearby is casting a shadow over the gardens and disrupting the flow of sunlight into a museum that's part of the site. (AP Photo/Tony Gutierrez, File)
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