Milecastle 39 between Crag Lough and Steel Rigg. Famous for being so well preserved. Some refer to it as Castle Nick because it is built into a nick in the hillside.

Looking east towards Crag Lough on our approach to Steel Rigg.

We think this butterfly is a Painted Lady.

Despite the blustery weather, the odd flash of summer sunshine on Hadrian's Wall always seems to conjure up a profusion of flowers, bugs and birds.

This wall section, near Cawfield Crags just to the west of Caw Gap, was among the tallest. Here I can't quite reach the top courses of stone.

Along some parts of Hadrian's Wall, the sheer vertical crags provided the main defence against potential attacks from the north.

Here's another milecastle. There were 79 in total, with turrets in between. Here in the Pennines they were built of local stone, with many substantially intact today. Others near the west coast were turf and earth constructions and have largely disappeared.