Getting there from Rome by car

To Caprarola, about an hour and a quarter on the Cassia to Monterosi and the Cimina. To Bomarzo, about an hour and a quarter on the A1 motorway to Orte or Attigliano. Between the two, about 30 km on the road across the Cimini mountains, about forty minutes. Without a car there is no practical way to do both in a day.