Go to the town perched on top of a hill. Wander around--it's a great way to see the houses which have been left (albeit being taken care of) for the last few hundred years.
Quick Tips:
Best Way To Get Around:
There's a public transport reaching here, as the nearest is either Viterbo or Orvieto. First, we have to get to Bagnoregio town, then from there walk to Civita de Bagnoregio for about 2km.