As the ground starts to rise again towards Butterdon, I pass a taller boundary stone, marked on the OS as “Longstone”, while the trig point on the hill ahead is another visual prompt. The first Butterdon cairn is already looking like a monster, silhouetted on the skyline. When I reach it, I find a small triangular stone in front of it, but can’t work out if it “belongs” to anything else – perhaps it’s part of the boundary line, but it looks to be of a different character and I make out (I think) a low semi-circular bank that appears to incorporate the stone. Another, even bigger, cairn marks the northern end of the summit. This is a huge cairn, 30 metres across and still 4 metres high. From here there are excellent views all around, with every hill apparently topped by more cairns.