It is rich in exotic plants, and on the square before the arboretum are two massive plane-trees over 400 years old, unique examples of this species in Europe. At the end of the 15th century, Ivan Gucetic built a summer residence here in the Gothic-Renaissance style, with a chapel and garden (1494-1502). The villa was rebuilt following the earthquake of 1667. The arboretum with its exotic vegetation (massive plane-trees, palms, eucalyptus, and camphor) is decorated with stone columns. In 1736, the Baroque fountain depicting Neptune and the nymphs was added.