Those pictures look like a great place to NOT bring a fine gun. Might 'wanna consider a Mossberg 500 with a battleship grey paint job, and leave the double for hunting hickory grouse and capercalie. When I was last in Europe, the authorities were 'kinda funny about rifles in 308, 223, 30-06 and sundry other military calibers. Kinda funny translating to don't even think about it.
Best,
Ted