Iirc the signal de botrange is 694m high, the staircase is 6m high so you get to 700m. Although it doesn’t look 6m high on the picture. I’ve only been there once as a kid, so might not be accurate.

I would vote for “Plowabunga!”

I like to imagine there are gnomes in lightpoles on little bikes generating the electricity required to keep the lamp lit.