Seville has one http://news.bbc.co.uk/1/hi/sci/tech/6616651.stm http://news.bbc.co.uk/1/hi/sci/tech/6616651.stm but the idea is as old, Archimedes is said to

Seville has one http://news.bbc.co.uk/1/hi/sci/tech/6616651.stm http://news.bbc.co.uk/1/hi/sci/tech/6616651.stm but the idea is as old, Archimedes is said to have used mirrors to set fire to a roman fleet.