74-miles long and 2,000 years old, Hadrian's Wall winds over the hills and valleys of Northern England, marking the northernmost extent of a long-dead empire. Built of stone and mortar by Roman soldiers, it is the most significant Roman ruin in England. Ordered built by the Emperor Hadrian around the time of his visit in 122 AD, it was more a permanent demarcation and less a defensive barrier. We'll visit this archaeological treasure, which teaches us much of what the Roman era was like for Britain.