Hadrian's Wall has been lit along its entire length for the first time in 1,600 years.
More than a thousand volunteers lit the 500 gas-powered beacons one-by-one to create a line of light more than 84 miles long.
Designed as a symbol of Emperor Hadrian's contemporary-sounding policy of "peace through strength", the wall marked the northern frontier of the Roman empire. Appropriately, the modern military joined in the illumination, with some of the beacons lit by servicemen from the RAF's electronic warfare centre in Spadeadam forest.
Si vis pacem, para bellum - if you wish for peace, prepare for war.
BBC: 'Line of light' at Hadrian's Wall