Coming from The North Wales coast road and crossing the Dee via the new bridge, a little further on after the paper mill, you, pass - on your left - Shotwick Lake sailing club. Across the fields near the eastern extreme you can see a strange shed or building. It is painted light green and obviously houses something tall inside.
A bit over a km further along the A548, you can see another identical one.
I have wondered about them for years, but getting to them seems pretty difficult. What roads there are are either blocked by locked gates or suitable only for those driving a tank.
Anyone got any idea what they are?