Via Ferrata is a mountain route equipped with fixed ladders, cables and bridges, to make it more accessible to climbers.   There's an awesome route starting a ten minute drive away in Sixt, at the Gorge des Tines.  Experienced folks with the right kit can just turn up and go.  

Our friends at ZigZag offer guided climbs, with a fully-qualified climbing instructor, and the loan of all the safety gear.  Completing the full circuit usually takes about three hours, including getting kitted up.  The minimum age for the Via Ferrata in Sixt is about 10 years old, as below this, the shorter ones tend to struggle with some of the reaches.