The family-run farmstead-estate of Farlam Hall is just a few minutes’ drive from one of the best-preserved sections of Hadrian’s Wall, the defensive fortification that formed the northern boundary of the Roman Empire for about 250 years. Begun in A.D. 122 and made chiefly of stone blocks, the wall took about six years to complete. Seventy-three miles long, it was originally about 20 feet high and 10 feet wide, with a fort every mile and two lookout turrets in between. The largest Roman structure in existence, it was added to the UNESCO World Heritage list in 1987.