How long did it take to build the Roman wall?
How long did it take to build the Roman wall? The building of Hadrian's Wall probably began that year, and took at least six years to complete. The original plan was for a wall of stone or turf, with a guarded gate every mile and two observation towers in between, and fronted by a wide, deep ditch.
What is the greatest wall in history?
The Great Wall of China (traditional Chinese: ????; simplified Chinese: ????; pinyin: Wànli Chángchéng, literally ten thousand li long wall) is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups ...