Because you feel you are inside the history. This place is full of energy and you can smell and see how ancient Roman time is interacting with today's Roman life. It is a huge city park crossed by two aqueducts, a small lake and fruit trees.
This is a free site but you have it all to learn its history thanks to the several panels. It is in a popular area and you will meet people practicing sport or dog sitting. It is particularly romantic for a last minute pic-nick at sunset.
Plan a last minute apero-picknick buying some cheap pizza slides at the close supermarket behind the church and sit up on the aqueducts at sunset time
Mon-Su: 09:00-01:00