This is Hadrian's wall. It's construction was begun in the year 122 by the order of the emperor Hadrian. The purpose of the wall was to keep the empire intact, a duty imposed on Hadrian by "divine instruction." Image from: http://www.bbc.co.uk/blogs/legacy/radio4/iot-hw.jpg
Heretic, Rebel, a Thing to Flout: Hey Donald! It’s an Old Idea—Ask Hadrian. According to sources I consult when choosing topics for the blog , on this date in 122 A.D. construction began on Hadrian’s Wall, a defensive fortification that stretched across the northern boundary of the Roman province of Britannia. How that can be determinedis unclear to me. The wall was built at the direction of the Emperor Hadrian who ruled the Empire from 117 to 138.
Callanish Standing Stones: The Callanish Stones are situated near the village of Callanish on the west coast of the isle of Lewis, in the Outer Hebrides. Construction of the site took place between 2900 and 2600 BC and the 13 largest stones form a circle of about 13 m in diameter.