In the ancient Rome era, many rich Roman families had their villas and gardens built on the Pincio Hill. Therefore the place was nicknamed the “Hill of Gardens”. The gardens you can visit today were however designed in the 19th century by Giuseppe Valadier.
Nowadays, the gardens are a popular place from where you can take in amazing views of Rome (e.g. of Piazza del Popolo which is located nearby). It is a quiet and calm place where you can enjoy a bit of greenery. An ideal time to visit the gardens is at the sunset when the view is most spectacular.
The nearest metro station is Flaminio (line A).
Wikipedia https://en.wikipedia.org/wiki/Pincian_Hill
Address Viale Gabriele D'Annunzio 00187 Roma, Italy
Coordinates 41°54'40.773" N 12°28'46.733" E