Clusium?

This archaeology article in the Economist was interesting.

Few tombs would be juicier than that of Lars Porsena, an Etruscan king who ruled in central Italy around 500BC. Porsena's tomb has been sought for centuries in the rubble under the Tuscan city of Chiusi, which is believed by most authorities to stand on the site of Porsena's capital, Clusium. No sign of it, however, has ever been found. And that, according to Giuseppe Centauro, of the University of Florence, is because everybody is looking in the wrong place.

It gets even better.

Chiusi was clearly once an Etruscan city, but the evidence that it was actually Clusium boils down to the fact that the two names mean the same thing (“closed”). Such nominative determinism is hardly conclusive. Dr Centauro prefers his evidence to be wrought in stone, and he thinks the most persuasive pile of masonry around is actually on a mountainside near Florence.

At the moment, he is awaiting permission from the authorities to start digging there. But the above-ground remains convince him that he has found the real site of Clusium. He believes he has identified two concentric walls 17km (about ten miles) in circumference—certainly big enough to qualify as the biggest city in Italy before the rise of Rome, which is the reputation that Clusium had.

Discovery.com has a bit more.  Makes me want to grab a trowel.  If it pans out, and luck is with them, then maybe they'll even find something that will shed some more light on the Etruscan language, which remains a mystery.