Bilbao's Iron Ring, Fortified line in Spain
Bilbao's Iron Ring was a complex system of bunkers, tunnels, and fortifications.
Designed during the Spanish Civil War to protect Bilbao from its enemies.
The iron ring is symbolic of the resistance offered by the Basque forces.
Parts of the original structures can be visited by history enthusiasts.
Despite its failure, Bilbao's Iron Ring remains a topic of military studies.
Location: Bilbao
Material: concrete
Source: Wikimedia
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