The Antonine Wall in Scotland, constructed almost 1900 years ago, was the northernmost Roman barrier in Europe, and became the newest extension to the Frontiers of the Roman Empire World Heritage Site in 2008. I visited one section of the wall at Rough Castle Fort on a sunny afternoon in September 2015. Rough Castle is very close to the Falkirk Wheel, so I parked by the wheel and continued on the path above the canal to the site of the fort on the Antonine Wall. Unfortunately, because the wall was turf-covered and the wood structures are no longer extant, not much is left to see. The most striking feature is a defensive ditch with a turf-covered rampart. Beyond the rampart are foundations for former structures, such as a barracks and a bath house, and most have helpful placards to provide context. I found the section of the Antonine Wall at Rough Castle Fort to be peaceful and interesting to explore, and I look forward to some day seeing other components of this World Heritage Site in England and Germany.
Logistics: The Antonine Wall stretches across Scotland between the Firths of Forth and Clyde, and is accessible by car and foot; the sensational Falkirk Wheel made a good base for parking and hiking to Rough Castle Fort.