Feed the culture lover within at Museo Civico Etrusco Romano. See if any guided tours are available or ask museum staff to direct you to some of the highlights.
This Trevignano Romano museum is an interesting place to kick off your day of sightseeing. There's loads to see and do in the vicinity, such as Castello Odescalchi, Italian Air Force Museum of Vigna di Valle, and Lake Martignano. Take your time at Museo Civico Etrusco Romano before heading to these other fine attractions.