Time Out says
The Pincio garden is best known for its view of the Vatican at sunset, with the dome of St Peter’s silhouetted in gold.
Overlooking piazza del Popolo, and now an integral part of the Villa Borghese, is one of the oldest gardens in Rome: the Pincio. The Pinci family commissioned the first gardens here in the fourth century. The present layout was designed by Giuseppe Valadier in 1814. The garden is best known for its view of the Vatican at sunset, with the dome of St Peter’s silhouetted in gold. The paved area behind the viewpoint is popular with cyclists (bikes can be hired nearby) and skaters. To the south-east of the Pincio is the Casina Valadier, now a pricey restaurant with a to-die-for view.