Lonely Planet review
Formerly the private grounds of Palazzo Corsini, Rome’s 12-hectare botanical gardens are a little-known, slightly neglected-feeling gem and a great place to unwind in a tree-shaded expanse covering the steep slopes of the Gianicolo, though the admission charge is unfortunately also a bit steep. Plants have been cultivated here since the 13th century.
However, in their present form, the gardens were established in 1883, when the grounds of Palazzo Corsini were given to the University of Rome. They now contain up to 8000 species, including some of Europe’s rarest plants. You'll find a Japanese garden and some impressive bamboo, and a collection of cacti in a glasshouse.