Colburn Hill is a bit of a brute to bag as it's a canny drive to the parking at Hethpool and you have a decent bit of climbing to get to it.
But they you probably have the best view in the whole of the Northumberland National Park over Bizzle Crags on the Cheviot.
Follow the route above or find it on OS Maps.
If you fancy bagging a few more hills on an epic adventure then follow this walk walk up Cold Law, Great Moor and Coldburn Hill. Or follow the path north to Hare Law and Newton Tors.