A narrow road has been carved out of the cliff high above the green river. It’s a hair-raising drive: a sheer vertical drop of more than 2300 feet, in many places too narrow for two-way traffic, with craggy rock overhangs, blind curves and hairpin turns, and thrillingly, no guardrail (!!) The road begins in the ancient fortified village of Castellane that guards a narrow mountain pass. At La-Palud-sur-Verdon, climbers gather to scale the vertiginous heights. And the road ends at Moustiers-Sainte-Marie, a breathtakingly beautiful medieval town perched on a mountainside, where paragliders sail silently from the mountain face hundreds of meters above. The local Provencal farmhouses have been turned into upscale villas and fancy resorts.