The opening times vary by month so do call ahead to make sure you can visit (and someone will be available to open the gate). The numbers are +393336853278 and +393335730225. The gatekeeper takes lunch from 13:30 to 14:30 (i.e. you can't visit between these times). Also, the site is closed on Monday.
Although interesting, there's not much info so you can see it relatively quickly.
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