Arboretum Marcel Kroenlein Parc National Du Mercantour

This alpine garden is probably the last thing you'd expect in tiny Roure. It's a pet project of Monaco's Prince Rainier, who's covered 15 steep-sided hectares (ranging in altitude from 1200m to 1700m) with mountain trees and flora, interspersed with sculptures by Niçois artists. If you're really lucky, you might even spot an eagle or vulture wheeling over the garden terraces.