There is cafe at the top. You can have a cup of coffee and take some pictures of Rome from the top terrace. Worth the visit, for the great views from the top.
Saint Peter in Chains or San Pietro in Vincoli is a church which is known becouse of the sculpture of Moses by Michelangelo which is a great work. It is said to that the chains were use on St. Peter.
This church must not be missed during a trip to Rome.