The Lines of Torres Vedras 1809-1811
The Lines of Torres Vedras 1809-1811
American Civil War Fortifications (1)
American Civil War Fortifications (1)
Japanese Castles 1540-1640
Japanese Castles 1540-1640
American Defenses of Corregidor & Manila Bay 1898-1945
American Defenses of Corregidor & Manila Bay 1898-1945
U-boat Bases and Bunkers 1941-45
U-boat Bases and Bunkers 1941-45
Hadrian's Wall AD122-410
Hadrian's Wall AD122-410
Defense of Japan 1945
Defense of Japan 1945
English Castles 1200-1300
English Castles 1200-1300
Japanese Fortified Temples and Monasteries AD 710–1062
Japanese Fortified Temples and Monasteries AD 710–1062
The Mannerheim Line 1920-39
The Mannerheim Line 1920-39