Subject: Re: New sites/museums
I believe this Italophile in the U.S. has the answer, from the Web site of the newspaper La Repubblica: the phone number in Rome (country code 39) is 06-39749907. You can reserve Monday-Saturday 8 a.m.-8 p.m. (it wasn't clear to me if those were phone answering times or opening hours). As of Friday, June 25, 5000 people had reserved, they allow in 25 people at a time for 45-minute tours; three groups at a time can be inside.

Andrew St. Joseph, Missouri