|
gptkb:Lines_of_Torres_Vedras
|
152
|
|
gptkb:Liège_forts
|
12
|
|
gptkb:Maunsell_Sea_Forts
|
seven
|
|
gptkb:Palamu_Fort
|
2
|
|
gptkb:Liwa_Forts
|
over 50
|
|
gptkb:Civil_War_defense_of_Washington,_D.C.
|
68
|
|
gptkb:fortifications_of_Bucharest
|
18
|
|
gptkb:Stelling_van_Amsterdam
|
42
|
|
gptkb:Solent_Forts
|
four
|
|
gptkb:Khaybar_forts
|
at least 7
|
|
gptkb:Liège_Forts
|
12
|
|
gptkb:Tegart_forts_network
|
approximately 62
|
|
gptkb:Fortifications_of_Washington,_D.C.
|
68
|
|
gptkb:Maunsell_Sea_Fort
|
four in Mersey Estuary
|
|
gptkb:Third_System_of_US_fortifications
|
over 40
|
|
gptkb:Lévis_Forts
|
3
|
|
gptkb:Antonine_Wall
|
about 16
|
|
gptkb:Maunsell_Sea_Fort
|
seven in Thames Estuary
|
|
gptkb:Cape_Girardeau_Civil_War_Forts
|
four
|
|
gptkb:Civil_War_Defenses_of_Washington
|
68
|