TIL of the 5th century BCE Long Walls of Athens, 6km long fortifications securing the city’s connection to the sea

https://en.wikipedia.org/wiki/Long_Walls
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1gdjr8w/til_of_the_5th_century_bce_long_walls_of_athens/