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In this video:

The ancient Romans were a people famed for their architectural prowess, something no better demonstrated than by their ability to build almost perfectly straight and incredibly durable roads spanning expansive distances. For example, in Britain alone, the Romans built well over 50,000 miles of roads with the longest rulerstraight stretch spanning over 50 miles. They did all of this in an era without modern surveying tools, construction equipment, or even very accurate maps of precisely where their destination was for many of the areas. So how did they do it?

Want the text version?: http://www.todayifoundout.com/index.p...

Sources:

https://www.jstor.org/stable/526811
http://www.historyrevealed.com/articl...
http://www.ancientpages.com/2017/08/0...
https://www.thevintagenews.com/2015/1...
http://www.romanobritain.org/12_innov...
http://www.romanobritain.org/12_innov...
https://en.wikipedia.org/wiki/Roman_r...
https://en.wikipedia.org/wiki/Twelve_...
https://www.romaevitam.com/romanroa...
https://www.historyhit.com/whywerer...
https://www.atlasobscura.com/articles...
https://www.ancient.eu/article/758/ro...
https://books.google.com/books?id=7Nq...
http://www.todayifoundout.com/index.p...
https://en.wikipedia.org/wiki/Roman_r...
https://en.wikipedia.org/wiki/Milliar...
https://en.wikipedia.org/wiki/Odomete...
https://en.wikipedia.org/wiki/Antikyt...
https://books.google.com/books?id=6iS...
https://en.wikipedia.org/wiki/File:Po...