Tarquinia is a town in Lazio, Italy. At first site it looks like a miniature version of San Gimignano with its medieval towers but the main reason for visiting is that it has fascinating Etruscan tombs with wall paintings (UNESCO World Heritage Site []), as well as a good museum on the Etruscans.
Trains run from Rome (mostly Roma Termini) and take about 1:30-2 hrs., cost about 7 Euro each way. Buses also run to and from nearby cities.
By car from Rome, take the Autostrada that runs northwest along the coast in the direction of Civitavecchia. Tarquinia is not too far after the end of the Autostrada at Civitavecchia but take care as the road is a popular stretch for the police to operate speed traps and catch you for overtaking illegally.
From Civitavecchia: There is a bus directly from the port in front of the Tarquinia InfoPoint, the bus company’s name is EUSEPI and you have to find a little blue or white bus. Line L departures at 7:15; 10:20; 11:20; 14:35; 17:20. Line I departures at 8:55; 13:25; 15:55 from Monday to Saturday. It takes about 20 minutes to get to Tarquinia.
There's a local bus to the necropolis.