Driving along the scenic old route between Scotland to England south of Berwick, I went 'What's that?!?', stopped and took some photos.
It turned out to be Codger Fort, an 18th Century fort designed to guard the road against an invasion from Scotland.
Codger Fort, Rothley – from the south
A bit closer, again from the south (HDR image)
Using the zoom
Same shot as previous (HDR version)
Same location, shot from lower down
Codger Fort from the north
The view across the valley from beneath Codger Fort
Looking south along the old road from Scotland
Same location, I think, but using the zoom
Looking over the other side of the road
Last shot before carrying on southwards