Limes Germanicus
Rome's 550-km German frontier — from the Rhine to the Danube.
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Rome's 550-km German frontier — from the Rhine to the Danube.
The most photographed tree in England, standing in Hadrian's Wall.
Home of Britain's oldest handwritten documents — the Vindolanda tablets.
Rome's most northern frontier — a 39-mile turf wall in Scotland.
Rome's northwest frontier — 73 miles of stone across northern England.
One of the 'Three Inner Passes' guarding Beijing's mountain route.
The 'Underwater Great Wall' — a Ming pass submerged by a reservoir.
The 'Lady's Pass' — defended by Princess Pingyang's women's army.
China's most contested pass — 3,000 years of war at the Goose Gate.
The 'Jade Gate' on the Silk Road — where jade entered ancient China.
The western terminus of the Ming Wall — 'First and Greatest Pass Under Heaven'.
Where the Great Wall meets the sea — the 'First Pass Under Heaven'.