There is another one more in the north : http://maps.google.com/maps?ll=42.609969,14.169220&spn=0.005453,0.007522&t=k&hl=en
it really seems to be an offshore platform.
Either one of those really could be http://en.wikipedia.org/wiki/Republic_of_Rose_Island>Rose Island. The first one looks like it's not far out enough, but it is the right size, and the second one looks like it is mostly occupied by a huge satellite dish, which wouldn't make sense.
On the other hand, the WP article says Rose Island was destroyed, but it doesn't really say if that meant the whole platform was destroyed, or just the buildings on it.
But the blurb at http://www.buckyogi.com/footnotes/natpr.htm#roses>Footnotes to History state that Rose Island (or Island or the Roses) was completely destroyed. So of course, if that is true, then this cannot possibly be it.
Info Requested, Offshore 
http://www.offshore-technology.com/contractors/power/ormat/ormat2.html
http://web.tiscali.it/adriasub/it/fotosedici.htm
This is a contender as well:
http://www.tim-thompson.com/aqua-alta.html
http://homepage.mac.com/paduan/PhotoAlbum38.html
(2nd row from the bottom)
http://www.deos.tudelft.nl/ers/tower.html
it really seems to be an offshore platform.
On the other hand, the WP article says Rose Island was destroyed, but it doesn't really say if that meant the whole platform was destroyed, or just the buildings on it.
But the blurb at http://www.buckyogi.com/footnotes/natpr.htm#roses>Footnotes to History state that Rose Island (or Island or the Roses) was completely destroyed. So of course, if that is true, then this cannot possibly be it.