Tags
- 5 cm Pak 38
- A
- Acropolis
- Agger
- Air-raid shelter
- Alcazaba
- Alcázar
- Amagansett, New York
- Amba
- American Civil War
- American Revolution
- Amphibious warfare
- An
- Ancud
- Anti-Aircraft
- Anti-tank trench
- Armour
- Armoured train
- Arrowslit
- Arsenal
- Artificial island
- Atlantic Wall
- Attraction
- Bailey
- Baltimore
- Barbarossa
- Barbed tape
- Barbed wire
- Barbette
- Barbican
- Barricade
- Bartizan
- Bastion
- Bastion fort
- Battlement
- Battle of France
- Bawn
- Beaches
- Bergfried
- Berm
- Bermuda
- Birgu
- Blast shelter
- Blast wall
- Blockhouse
- Bomb shelter
- Boom
- Border barrier
- Border outpost
- Border Security
- Breastwork
- Bremer wall
- Bridge tower
- Brisbane
- British anti-invasion preparations of the Second World War
- Broch
- Bunker
- Burgh
- Burgus
- Burh
- Caër
- Caltrop
- Camouflage
- Canal
- Caponier
- Captaincy General of Chile
- Cartagena, Colombia
- Casemate
- Castellum
- Castle
- Castle town
- Castra
- Cavalier
- Château
- Chemin de ronde
- Chemise
- Chiloé Archipelago
- Choke point
- Citadel
- City gate
- City guide
- Civil defense
- Climate
- Climate change
- Coast
- Coastal artillery
- Comino
- Concepción, Chile
- Concertina wire
- Continuity of government
- Conwy Castle
- Corner tower
- Cottonera Lines
- Counter-castle
- Coupure
- Covertway
- Crannog
- Crimean War
- Crownwork
- Curtain wall
- Czech hedgehog
- Defender
- Defense line
- Defensive fighting position
- Defensive wall
- Digital Fortress
- Ditch
- DOI
- Dragon's teeth
- Drawbridge
- Dun
- Dungeon
- Dutch East India Company
- Dwarf Fortress
- Dzong architecture
- Edward I of England
- Electric fence
- Embrasure
- Enceinte
- Encyclopædia Britannica Eleventh Edition
- England
- Entrenchment
- Europe
- Explore
- Extreme weather
- Fallout shelter
- Faussebraye
- Festung
- Fetislam
- Fire support base
- First Barbary War
- Flak tower
- Flanking tower
- Fleche
- Florida
- Florida beaches
- Fort Delimara
- Fort Denison
- Fort Drum
- Fortification
- Fortified church
- Fortified house
- Fortified tower
- Fort Louvois
- Fort Manoel
- Fort McHenry
- Fortress America
- Fort Ricasoli
- Fort Saint Elmo
- Fort St. Angelo
- Fort Sumter
- Fort Zeelandia
- Forward operating base
- France
- Fujian Tulou
- Gabion
- Gatehouse
- Gate tower
- Gibraltar
- Glacis
- Golden Horn
- Gord
- Gorge
- Gozo
- Grand Harbour
- Great Siege of Malta
- Grover Cleveland
- Guard tower
- Guernsey
- Guide
- Gunpowder magazine
- Gun turret
- Halifax, Nova Scotia
- Harbour
- Hardened aircraft shelter
- Helsinki
- Henry VIII of England
- Hill castle
- Hillfort
- Hilltop castle
- Historia
- Hoarding
- Hong Kong Island
- Hornwork
- Hurricane Ida
- Ideas
- Inner bailey
- International Standard Book Number
- Ironclad warship
- Island castle
- Jagdschloss
- Japan
- Japanese castle
- Jersey
- John Smith
- Kabal
- Kaiserpfalz
- Kanyakumari
- Kasbah
- Keep
- Kh-35
- Knights Hospitaller
- Kremlin
- Ksar
- Land mine
- Landwehr
- Legion of Merit
- Limés
- Littoral
- Loophole
- L-plan castle
- Lunette
- Lustschloss
- Machicolation
- Magazine
- Malta
- Marines
- Marsaxlokk
- Martello tower
- Masonry
- Medieval fortification
- Merlon
- Meteorology
- Military
- Military aviation
- Military base
- Minesweeper
- Ming Dynasty
- Missile launch facility
- Moat
- Most
- Motte-and-bailey castle
- Murder-hole
- Murud-Janjira
- Nadu
- Natural Disaster
- Naval artillery
- Naval mine
- Navy
- New
- New World
- New Zealand
- Nothe Fort
- Nuraghe
- Observation post
- Old San Juan
- Operation Pastorius
- Oppidum
- Ordensburg
- Ostrog
- Outer bailey
- Outpost
- Outwork
- Palanka
- Palas
- Palisade
- Pampus
- Peel tower
- Picket
- Pillbox
- Pirate
- Place
- Places
- Port
- Portcullis
- Portugal
- Postern
- Powder Tower
- Presidio
- Qalat
- Qing dynasty
- Railway gun
- Rampart
- Ravelin
- Redan
- Redoubt
- Reduit
- Reinforced concrete
- Retrenchment
- Revetment
- Ribat
- Ricetto
- Ringfort
- River Mersey
- Rocca
- Rock Castle
- Roman Britain
- Roman Gaul
- Romantic
- Roundel
- Royal United Services Institute
- Russia
- Sally port
- Sandbag
- Sangar
- Schanze
- Schloss
- Sconce
- Seacoast defense in the United States
- Sea level
- Sea level rise
- Searchlight
- Security
- Senglea
- Sentry gun
- Seven Years' War
- Shield wall
- Shore
- Shores
- Siege
- Siege engine
- Sino-French War
- Sopu Tower
- Southampton town walls
- Spanish Empire
- Spider hole
- Station
- Steamship
- Stockade
- Storm
- Strait of Dover
- Submarine
- Submarine pen
- Subterranean warfare
- Sudis
- Suomenlinna
- Taku Forts
- Tamil Nadu
- Team Fortress Classic
- Tenaille
- Thames Estuary
- This week
- Tidal island
- Tourism
- Tourist
- Tourist Attraction
- Tower castle
- Tower House
- Trench
- Trench warfare
- Tropical cyclone
- Tunnel warfare
- Turret
- U-boat
- United Kingdom
- United States Coast Guard
- Urban guerrilla warfare
- Urban warfare
- Valletta
- Vallum
- Valparaiso
- Vedette
- Victorian era
- Viking
- Wagon fort
- War of 1812
- Watchtower
- Water castle
- Wayback Machine
- Weapon
- Weather
- Weather forecasting
- Wessex
- Weymouth, Dorset
- What
- Wire obstacle
- World War I
- World War II
- Yett
- Zwinger