This is the palace where the Pacelli family rented rooms every summer while vacationing back in the 1870s, 80s and 90s. We were there last autumn and got a private tour courtesy of the then mayor.
See the Onano site here: http://www.comune.onano.vt.it/index.php?T1=9101.
Pius XII's father was born in this town and they as a family spent every summer here in the hills from June until September during the childhood of the future pope.
As a child the future Pius XII and his siblings walked the hills in the countryside here and visited the charming little shrines in the fields built by shepherds. It was really neat to be there. The town church was completly destroyed during WWII.
Such an honor to pray there and if you have a rental car be sure to visit (as no train goes there)!