Illuminating Hadrian’s Wall

This weekend I have been up to Northumberland to witness the illumination of Hadrian’s Wall. This is the view eastwards from Vercovicium or Housesteads Roman Fort. A beacon was lit about every 250m along its length across Britain.

The geology angle is, of course, that the Roman’s used the geology as part of the defences, with Hadrian’s Wall running along the top of the escarpment produced by the outcrop of the Great Whin Sill. Below is Housesteads from Google Earth.