Milefortlet 16 - Credit: Wikimedia Commons
Milefortlet 16 was a Milefortlet of the Roman Cumbrian Coast defences. These milefortlets and intervening stone watchtowers extended from the western end of Hadrian's Wall, along the Cumbrian coast and were linked by a wooden palisade. They were contemporary with defensive structures on Hadrian's Wall. There is little to see on the ground but Milefortlet 16 has been located. Read more on Wikipedia
Source: en.wikipedia.org