Fortification

Krak des Chevaliers is one of the best-preserved Crusader castles.[1]

Bourtange star fort, restored to 1750 situation, Groningen (province), Netherlands.

The well preserved Bulgarian medieval fort Baba Vida.

Fortifications on the Iraq-Iran Border, viewed from the ISS, 2014

Fortifications are military constructions or buildings designed for the defense of territories in warfare, and also used to solidify rule in a region during peace time. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs. The term is derived from the Latin fortis ("strong") and facere ("to make").

单词	Defensive works
释义	Defensive works 英语百科 Fortification Fortifications are military constructions or buildings designed for the defense of territories in warfare, and also used to solidify rule in a region during peace time. Humans have constructed defensive works for many thousands of years, in a variety of increasingly complex designs. The term is derived from the Latin fortis ("strong") and facere ("to make").
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Defensive works

Fortification