The BEST episodes written by Joanne Fish

#1 - Forts

Modern Marvels - Season 6 - Episode 34

Fortification evolved along with man's need to defend his territory from attack. From hills surrounded by fences to walled cities to impenetrable castles, these strongholds of the past echo the history of battles for territorial control. Join us as we learn how, as weaponry grew in sophistication, those walls came tumbling down.