“Socks are key. Dry socks in fact. They’re the most important thing you need to pack,” my guide Giorgi says nonchalantly. “You should never go hiking without an extra pair.” I nod approvingly but ...

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My son, Marc, and I had tramped through shin-deep snow for several hours. By the time we reached the blustery top of the peak, we couldn’t see more than a few metres around us because of a whiteout.

What’s the route?: It links diverse European geosites, from Poland’s alpine lakes to Georgia’s Caucasus villages, with geological and cultural highlights. Why it matters: Combines hiking, heritage, ...