My friends an I got the OmniaPass for easy access to the Vatican museums, and St. Peter's Prison was on the list of free attractions offered by this pass. We didn't actually plan to visit this place, but it was right outside the Forum, so it seemed like a waste not to go in.
In fact, it was a complete waste. What greeted us was an audio tour. We went down to the one cell and listened to some audio. Up to that point it was sort of OK for a start. But then we were led into a bunch of other run-of-the-mill rooms to watch some videos and more audio. The most ridiculous part was a "story" about Rome's walls "arguing" with one another. Then everything ended and we were again outside.
The experience was so strange and so far from what any of us expected that we now even have an inside joke about the place, where "St. Peter's Prison" for us means anything that doesn't meet expectations in a completely ridiculous and jaw-dropping way.
Avoid this place, and definitely don't pay for it.
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