Hadrian's Wall is one of Britain's major ancient tourist attractions and one of the country's UNESCO sites, it was designated as World Heritage Site in 1987.
The 1st card was sent by Miguel last september and Stephanie sent the 2nd two years ago.
Hadrian's Wall was a defensive fortification in Roman Britain, begun in AD 122 during the rule of emperor Hadrian. In addition to its military role, gates through the wall served as customs posts.
A significant portion of the wall still exists and can be followed on foot along the Hadrian's Wall Path.
Reproduced from a stamp designed by Godfrey Design * Photo © Peter Marlow / Magnum Photos
Hadrian's Wall was built, beginning in 122, to keep Roman Britain safe from hostile attacks from the Picts. It was the northernmost boundary of the Roman empire until early in the fifth century.
The wall, stretching from the North Sea to the Irish Sea (from the Tyne to the Solway), was 80 Roman miles (about 73 modern miles) long, 8-10 feet wide, and 15 feet high. In addition to the wall, the Romans built a system of small forts called milecastles (housing garrisons of up to 60 men) every Roman mile along its entire length, with towers every 1/3 mile.
Sixteen larger forts holding from 500 to 1000 troops were built into the wall, with large gates on the north face. To the south of the wall the Romans dug a wide ditch, (vallum), with six foot high earth banks.
Today many of the stones have been carted away and recycled into other buildings, but the wall is still there for people to explore and walk along, although the latter is discouraged. - in: http://ancienthistory.about.com/cs/rome/a/aa060600a.htm