There are only ruins left from the former Byzantine castle at this site. However, you can still see that once it used to be magnificent.
Wikipedia https://fi.wikipedia.org/wiki/Palaió_Pylín_linna
More information at Kosinfo.gr http://www.kosinfo.gr/villages/pyli
Address 85300, Greece
Coordinates 36°50'17.833" N 27°11'14.477" E