Looks like a stage for plays.......................
The Romans were fascinated by the Etruscans. They adopted much of their culture and even compiled a significant written history of them. Sadly those manuscripts have not survived. Hopefully an intact, well preserved library will one day be found at Pompeii or somewhere.
Aaaahhhhhh.....
I can see the lovely gondolas of Bomarzo careening down the canals..... people screaming......the romance of it all.
Lovely civilization. I went to the National Etruscan Museum in the Villa Giulla in Rome. In fact, I went twice during the month I was there. Etruscans had incredible skill at making gold jewelry and other objects. So happy I got to see it.