This small lovely park, lying on the bank of river Tiber, a bit to the east from the city of Vatican, surrounds the famous Castel Sant'Angelo.You can walk around the building or just relax on a bench here.
The park offers a chance for taking some great pictures of the Castel nearby. There is also drinking water available.
The park is always open.
Free
Wikipedia https://en.wikipedia.org/wiki/Parco_Adriano
Address Parco Adriano, 00193 Roma, Italy
Coordinates 41°54'13.719" N 12°27'58.744" E