I saw some pictures where the fountains and metro are getting maintenance.
Can someone point me to a list of all things that will potentially be closed or will be undergoing maintenance in August? I am especially interested in the Trevi, and other famous areas.
I haven't seen a compiled list of monuments or structures either currently under renovation or expected to be for the 2025 Jubilee. Works that involve closures or changes in visiting hours tend to be noted on the official, individual websites for the attractions themselves. If you can be more specific about the attractions you are planning to see and the dates you're trying to do that, maybe we can offer more help.
I don't expect Jubilee to affect Trevi as it underwent an expensive renovation in 2014 - 2015.
August is the Ferrogusto holiday, and while all the main tourist attractions are unaffected, many smaller shops and restaurants close so their staff can go to the mountains or the sea, as is traditional. You will perhaps see signs saying "Chiusa per ferie" which means closed for the holiday, typically around the middle of the month.
I hear the Piazza Navona will be boarded up.
The fountains in Piazza Navona and at the Pantheon are currently boarded up with a little viewing window cut out of the boards. Trevi is as normal right now.
You can view some locations around Rome, including Piazza Navona, on these live cams:
https://www.skylinewebcams.com/en/webcam/italia/lazio/roma/piazza-navona-roma.html
The construction you see in Piazza Venezia isn't related to Jubilee but to long-term (it's a 10-year project) ongoing work for extension of the Metro C line. https://www.saturdaysinrome.com/blog/piazza-venezia-construction/
The good news is that there will be plenty in Rome that won't be under renovation/construction. For instance, it looks like Campo de' Fiori, Spanish Steps and Piazza Santa Maria in Trastevere are untouched. I've seen no mention of major work going on at the Colosseum, Forum and Palatine, the interior of the Pantheon or many of Rome's churches, either.
Livecam of St Peter's Square:
https://www.webcamtaxi.com/en/vatican/vatican-city/st-peters-square.html
