WDefense line
WAtsukashiyama Barrier
WBerm
WBraefoot Battery
WFort de Bron
WBuzi (fortification)
WFort de Caluire
WCorradino Lines
WCottonera Lines
WDanevirke
WFort Decaen
WDowning Point Battery
WFort Duchère
WFloriana Lines
WFort de Montessuy
WGreat Wall of China
WGreat Wall of Gorgan
WHadrian's Wall
WHexamilion wall
WHowlett Line
WIJssel Line
WIraq–Saudi Arabia border
WKelasuri Wall
WKönigsberg fortifications
WLines of Contravallation of Gibraltar
WMadukkarai Wall
WFort Montbarey
WMurus Dacicus
WMurus Gallicus
WOffa's Dyke
WOuter London Defence Ring
WQuadrilatero
WQuestel Fort
WRoyal Military Canal
WFort Saint-Jean (Lyon)
WSanta Margherita Lines
WSaxon Shore
WSerpent's Wall
WStrata Diocletiana
WLines of Torres VedrasWVictoria Lines
WWat's Dyke
WWestern Russian fortresses
WZanja de Alsina
WGreat Zasechnaya cherta