Saw this one a few days ago. It flew in and landed on my shirt, I was at the time wearing a rather fetching shiny green silk shirt that I bought some years ago in Vietnam….. it was olive green not too o. t. t.
Anyway I persuaded it to move off my shirt and onto some rocks so I could photograph it.
It is called The Rosalia longicorn (Rosalia alpina) or Alpine longhorn beetle,
According to wikipedia ‘They are distributed from the Alps east to Slovakia. Its numbers across Europe has greatly depleted in recent years, and it is a protected species in Germany, Hungary, Poland and Slovenia‘. This one however was living free in the European Zoo in Poitou-Charentes, France….. a long way from the Alps.