Archaeologists baffled by mystifying feature at Hadrian's Wall: 'Don't know why'

The Roman Empire's conquest of Britain began almost 2,000 years ago. It changed the face of the country forever. Roman culture, food, art, as well as the myriad religions that were practiced across the Empire were brought to the island's shores.

To occupy and cordon off swathes of land the Romans erected forts and walls around Britain, many of which survive today.

One of the most notable pieces is Hadrian's Wall.

Stretching 73 miles from the banks of the River Tyne near the North Sea, all the way west to the Solway Firth near the Irish Sea, work on the Wall started in 122 AD.

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