The Col de Petit Saint Bernard is a main summer access to the Aosta Valley in Italy. All this area was once Celtic and they still recognise their Celtic origins on the Italian side.
The photo below shows both sides of a Celtic stone circle at 7180ft altitude (the path through the middle was the old road (removed to reveal and recover the stone circle). On the right you can see a line of tank traps from WW2. The white capped mountain top second from the left is Mont Blanc.
The Savoie flag on the French side of the border. Interesting resemblance to the Swiss flag and probably similar Templar origins. Local traditions still follow the Isis mythology - though they are unaware of the significance.