11. The Church of Santi Domenico e Sisto the campus church of the Pontifical University of St. Thomas Aquinas. Too bad it is often closed. The wall in the background is part of Villa Aldobrandini complex and it incorporates fortress-like wall, which I'd guess dates from the Dark Ages when anyone with money hid themselves in urban fortresses.
12. This one was taken from the church of Santi Domenico e Sisto. You can see the scale of the Villa Aldobrandini's wall more clearly here.
13. Santi Domenico e Sisto.
14. The church has a glacis wall too.
15. Villa Aldobrandini gardens.

12. This one was taken from the church of Santi Domenico e Sisto. You can see the scale of the Villa Aldobrandini's wall more clearly here.

13. Santi Domenico e Sisto.

14. The church has a glacis wall too.

15. Villa Aldobrandini gardens.
