I visit Verona a couple of times of year and have just heard of the Pantheon of Santa Maria in Stelle, a few kilometers north of the city center. I have been looking online but have yet to find any information about how, or even IF you can visit the underground site.
Also, looks to be about 7 kilometers and am wondering if it is possible or advisable to walk or bicycle from the city center? Google Maps offers several options (about 2 hours walking), but am unsure if the roads, paths, etc. are good for people on foot.