The Etruscan necropolis of Tarquinia is a Unesco World Heritage Site located on the Monterozzi hill, approximately an hour and half drive from Capena.
It is extremely famous for its painted tombs, carved into the rock, accessible by stairs or sloping corridors. Most of them have been built for a single couple and are a burial chamber. The first tombs containing paintings date back to the seventh century.
...but their beauty can't be described in words; you need to see them with your eyes.