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A hike to the famous Tour Isabelle natural double arch (also named the Tour Percée or Pierced Tower). Its span is 32 metres (105 ft), which makes it the biggest natural arch in the Alps.
It remained unknown for probably everybody, until its discovery in May 2005.
On the verge to double arch Tour Percée
6.8 h: 11.9 km 1000 m up over 1880 m 1000 m down
Starting point: Bus stop Plateau-des-Petites-Roches, Col de Marcieu
Climbing up and down on the verge (just careful hiking, no equipment needed).
Tour Percée
Back to the bus
On the verge of Massif de la Chartreuse: double arch Tour Percée
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