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Manmade features
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Towers
Manmade structures, higher than their diameter, generally used for observation, storage, or electronic transmission. [USGS Feature Class Definitions <
http://geonames.usgs.gov/domestic/feature_class.htm
>]
Alexandria Digital Library Feature Type Thesaurus
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Windmills
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Environmental studies of the World Trade Center area after the September 11, 2001 attack
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Report describing the results of an interdisciplinary environmental study of the World Trade Center (WTC) area after the attack on September 11, 2001. The investigations included imaging spectroscopy mapping and laboratory analysis.
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