You can visit it all year round on weekends, in these hours.
An early online booking is advisable at the following e.mail:
You have to specify day, hour of visit and number of visitors, that can not exceed 4 visitors per turn.
In particular cases you may ask for a weekdays booking, at the same e.mail address.
In case of extraordinary liturgical celebrations, such as funerals, weddings, baptisms or annual religious events, scheduled visit hours, may change or be cancelled. (Church and Hypogeum are connecting).

There is not an entrance ticket, but personal offers are mostly appreciated, to support opening and maintenance of the site.