It is terrain that has been censored. All the military sites, most refineries and power plants and some other sites that are in Italy and in images provided by this particular service have been censored. Some, like this one are done quite clumsily (note the sharp edges.) Other locations have been done quite carefully. See this discussion here:
Intentionally Altered 
http://virtualglobetrotting.com/forums/showflat.php/Cat/0/Number/2780/an/0/page/0#2780