These are our geographical coordinates:
LAT: 43° 13' 59,43'' NORD (43.233175 N)
BE CAREFUL IF YOU ARE USING A GPS SYSTEM! in Umbria there are 2 towns named Petroia, one located in Città di Castello and another one in Gualdo Tadino.
The Petroia Castle is located in the town of Gubbio; to find it on the GPS you should set GUBBIO as city and then PETROIA as town/street.