View point of The Observatory Of Pic Du Midi De Bigorre, Hautes Pyrenees, Midi Pyrenees, France. The 12m Ponton dans le ciel, a glass walkway high above the Pyrenees at Pic du Midi de Bigorre, a 2877m mountain in the French Pyrenees, home to an astronomical observatory and visitors centre. The observatory is acccessible from the village of La Mongie by cablecar. Tourists often visit in time for the spectacular sunset across the mountains.