1     Japanese Pacific Island Defenses 1941-1945
2     Hadrian's Wall 122-410 AD
3     U-Boat Bases and Bunkers 1941-1945
4     American Defenses of Corregidor and Manila Bay 1898-1945
5     Japanese Castles 1540-1640
6     American Civil War Fortifications (1) : Coastal Brick and Stone Forts
7     The Lines of Torres Vedras 1809-1810
8     Defenses of Pearl Harbor and Oahu 1907-1950
9     English Civil War Fortifications 1642-1651
10    The Maginot Line 1928-1945
11    Crusader Castles of the Teutonic Knights (1) : The Red Brick Castles of Prussia 1230-1466
12    Fortresses of the Peninsular War 1807-1814
13    Norman Stone Castles (1) : The British Isles 1066-1216
14    Fortifications in Wessex c. 800-1066 : The Defenses of Alfred the Great against the Vikings
15    Germany's West Wall : The Siegfried Line
16    The Fortifications of Malta 1530-1945
17    Troy c.1700-1250 BC
18    Norman Stone Castles (2) : Europe 950-1204
19    Crusader Castles of the Teutonic Knights (2) : The Stone Castles of Latvia and Estonia 1185-1560
20    British Home Defences 1940-1945
21    Crusader Castles in the Holy Land 1097-1192
22    Mycenaean Citadels c. 1350-1200 BC
23    German Field Fortifications 1939-1945
24    Fortifications of the Western Front 1914-1918
25    The Walls of Constantinople 324-1453 AD
26    Afghanistan Cave Complexes 1979-2004 : Mountain Strongholds of the Mujahideen, Taliban & Al Qaeda
27    French Fortresses in North America 1535-1763 : Quebec, Montreal, Louisbourg and New Orléans
28    Forts of the American Frontier 1820-1891 : Central and Northern Plains
29    US World War II and Korean War Field Fortifications 1941-1953
30    Fort Eben Emael : The Key to Hitler's Victory in the West
31    Rome's Northern Frontier 70-235 AD : Beyond Hadrian's Wall
32    Crusader Castles in the Holy Land 1192-1302
33    Special Forces Camps in Vietnam 1961-1970
34    Japanese Fortified Temples and Monasteries 710-1062 AD
35    British Fortifications in Zululand 1879
36    US Strategic and Defensive Missile Systems 1950-2004
37    D-Day Fortifications in Normandy
38    American Civil War Fortifications (2) : Land and Field Fortifications
39    Russian Fortresses 1480-1682
40    Ancient Greek Fortifications 500-300 BC
41    The Channel Islands 1941-1945 : Hitler's Impregnable Fortress
42    The Vauban Fortifications of France
43    Roman Legionary Fortresses 27 BC - 378 AD
44    American Coastal Defences 1885-1950
45    German Defences in Italy in World War II
46    Castles and Tower Houses of the Scottish Clans 1450-1650
47    Fortifications of the Incas 1200-1531
48    Viet Cong and NVA Tunnels and Fortifications of the Vietnam War
49    The Spanish Main 1492-1800
50    The Forts of Celtic Britain
51    Indian Castles 1206-1526 : The Rise and Fall of the Delhi Sultanate
52    The Fortifications of Gibraltar 1068-1945
53    Defending Space : US Anti-Satellite Warfare and Space Weaponry
54    Forts of the American Frontier 1820-1891 : The Southern Plains and Southwest
55    Cathar Castles : Fortresses of the Albigensian Crusade 1209-1300
56    Rome's Saxon Shore : Coastal Defences of Roman Britain 250-500 AD
57    The Great Wall of China 221 BC - 1644 AD
58    Vietnam Firebases 1965-1973 : American and Australian Forces
59    Crusader Castles in Cyprus, Greece and the Aegean 1191-1571
60    The Forts of the Meuse in World War I