The Abbey can be visited
Abbazia di San Giovanni in Argentella

Near Palombara Sabina, in Lazio, is the Abbazia di San Giovanni in Argentella, a historic monastery. The complex has its origins deeply rooted in history.
History+
The founding of the church is attributed to the Lombards and dated to the year 529. It is believed that the name "in Argentella" comes from a nearby spring, possibly in Valle Lunga. Building materials from a Roman villa or temple from the surrounding area may have been reused for the construction. In the 11th century, the abbey underwent extensive renovation.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: Silvio sorcini · Wikimedia Commons · CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 42.0551, 12.7524