Not hidden, but there are three Caravaggio paintings in the church of St Luigi dru Francesci near the Pantheon. Insert a coin to turn lights on a painting.

It's easy to walk to this church and see a Michelangelo masterpiece:

TheRisen Christ, Cristo della Minerva in Italian, also known as Christ the Redeemer or Christ Carrying the Cross, is a marble sculpture by the Italy High Renaissance master Michelangelo, finished in 1521. It is in the church of Santa Maria sopra Minerva in Rome, to the left of the main altar.

Great idea! I think it is the only gothic church in Rome. It also contains some marvelous frescos by Filippino Lippi.

I wholeheartedly support the Borghese as well, one of my favorite museums. I also think the crypts are a toss up. My son thought it was very cool if a little unsettling and my daughter thought it was morbid. Both of mine were in their late teens when they went.
Context offers some interesting tours, an underground tour and Ostia Antica. Their website might give you some good ideas on different things to explore. I think we did a tour of Villa Farnesina with them, great guide and a good walk too.
A cheesy photo op but we went to Bocca Della verita . I have an Audrey Hepburn fan and she thought that was fun.

Yo Warner,
Maybe consider renting ebikes to explore the Appian Way? Sundays would be best coz it is car-free then.
Or if you all like gardens, check out Ninfa Gardens, an hour away near Latina. *Note that you must sign up ahead for a guided tour and that its only open on specific dates.
Hope all goes well.
I am done. the end.

The Gardens of Ninfa are really wonderful, developed in the ruins of the medieval town of Ninfa, owned by the noble Caetani family. The town was abandoned in the 14th century. The gardens are maintained by the Caetani foundation, which also maintains the nearby Castle of Sermoneta, which was also a Caetani property. The foundation was established by the widow of one of the last members of the family, which died out in the 20th century.

Until recently, the gardens were not open often, but now they seem to be open every weekend, and on national holidays, and some other dates. They may be closed in the winter. I only see a calendar through the 1st of November.

You must reserve your visit, and numbers are limited.

There remains the problem of getting there, as there is no public transportation serving the gardens. The nearest train station is 7 km away at Latina Scalo, and you can get a taxi from there.

https://www.giardinodininfa.eu/

You should also try to visit the castle and the beautiful town of Sermoneta, also not served by public transportation. It seems to be open the same dates as the garden, although the calendar only goes through the 25th of June.
​​​https://www.giardinodininfa.eu/colle...i-di-sermoneta
There are tour groups from Rome that visit the garden and the castle. I wouldn't want to visit with a very large group.

[QUOTE=yestravel;17450064]Great