Sites
- aljazeera.com
- apnews.com
- bbc.co.uk
- bordercenter.org
- cis.org
- cnn.com
- dw.com
- Migrationnexus.com
- migrationobservatory.ox.ac.uk
- migrationpolicycentre.eu
- Migrationpolicydebate.eu
- Migrationpolicyinstitute.eu
- migrationpolicy.org
- Migrationpolicypractice.org
- migrationwatchuk.org
- nytimes.com
- reuters.com
- theguardian.com
- usatoday.com
- washingtonpost.com
Tags
- A
- Acropolis
- Afghanistan
- Agger
- Air-raid shelter
- Alcazaba
- Alcázar
- Alejandro Mayorkas
- Amba
- Anti-tank trench
- Antonine Wall
- Argentina
- Arrowslit
- Arsenal
- Asilah
- Associated Press
- Austria
- Bailey
- Bangladesh
- Barbed tape
- Barbed wire
- Barbette
- Barbican
- Barricade
- Bartizan
- Bastion
- Battlement
- Bawn
- BBC
- BBC News
- Belarus
- Belize
- Bergfried
- Berlin Wall
- Berm
- Blast shelter
- Blockhouse
- Bloomberg News
- Blue Line
- Bolivia
- Bomb shelter
- Border
- Border control
- Border fences
- Border outpost
- Border Security
- Botswana
- Boundary delimitation
- Breastwork
- Bremer wall
- Bretèche
- Bridge tower
- British anti-invasion preparations of the Second World War
- British Raj
- British rule in Burma
- Broch
- Brunei
- Buffer zone
- Bulgaria
- Bunker
- Burgus
- Burh
- Business Insider
- BuzzFeed
- Caër
- Caltrop
- Canada–United States border
- Canal
- Caponier
- Casemate
- Castellum
- Castle
- Castle town
- Castra
- Cavalier
- Château
- Chemin de ronde
- Chemise
- Chile
- China
- China–North Korea border
- Circular rampart
- Citadel
- City gate
- Civil defense
- CNN
- Coastal artillery
- Coastal defence and fortification
- Coercion castle
- Cold War
- Company rule in India
- Concentric castle
- Concertina wire
- Continuity of government
- Corner tower
- Costa Rica
- Coupure
- Covertway
- Crannog
- Croatia
- Crown of Castile
- Crownwork
- Curtain wall
- Cyprus
- Danevirke
- Defense line
- Defensive fighting position
- Defensive wall
- Demilitarized zone
- Denmark
- Deutsche Welle
- Ditch
- Dominican Republic
- Dragon's teeth
- Drawbridge
- Dun
- Dungeon
- Dutch East Indies
- Dzong architecture
- Egypt
- Egypt–Gaza barrier
- Electric fence
- Embrasure
- Emirate of Granada
- Empire of Japan
- Enceinte
- Entrenchment
- Eritrea
- Estonia
- Ethiopia
- Executive Order 13767
- Fallout shelter
- Favela
- Festung
- Finland
- Fire control tower
- Fire support base
- Fleche
- Fortification
- Fortified church
- Fortified house
- Fortified tower
- Forward operating base
- Fox News
- France
- France 24
- Franco-German border
- French colonial empire
- French Indochina
- Frontier Closed Area
- Gabion
- Ganerbenburg
- Gatehouse
- Gates of Alexander
- Gate tower
- Gaza Strip
- Germany
- Gibraltar
- Glacis
- Gord
- Gorge
- Great Britain
- Great Wall of China
- Greece
- Green Line
- Guard tower
- Guatemala
- Gunpowder magazine
- Gun turret
- Hadrian's Wall
- Haiti
- Hamas
- Han Chinese
- Hanko Peninsula
- Hardened aircraft shelter
- Hesco bastion
- Hill castle
- Hillfort
- Hillside castle
- Hilltop castle
- Him
- Hmong people
- Hoarding
- Hong Kong
- Hornwork
- HuffPost
- Human trafficking
- Hungarian border barrier
- Hungary
- Illegal immigration
- Imperial castle
- India
- Indonesia
- Inner bailey
- Inner German border
- International Standard Serial Number
- Iran
- Iran–Pakistan border
- Iraq
- Iron Curtain
- Island castle
- Israel
- Israeli West Bank barrier
- Italy
- Jagdschloss
- Japanese castle
- Kabal
- Kaiserpfalz
- Kasbah
- Kazakhstan
- Keep
- Kingdom of Granada
- Kingdom of Portugal
- Korean Demilitarized Zone
- Kremlin
- Kruger National Park
- Ksar
- Kuwait
- Kwantung Leased Territory
- Kyrgyzstan
- Land mine
- Landwehr
- Latvia
- Lebanon
- Libya
- Limbang
- Limés
- Limes Germanicus
- Lithuania
- Loophole
- Lunette
- Lustschloss
- Macau
- Macedonia
- Magazine
- Maginot Line
- Mainland China
- Malaysia
- Malaysia–Thailand border
- Manchukuo
- Mapuche
- Maratha Empire
- Marinid dynasty
- Martello tower
- Medieval fortification
- Merlon
- Mexico
- Mexico–United States barrier
- Migrant
- Military base
- Military urbanism
- Ming Dynasty
- Missile launch facility
- Moat
- Moroccan Western Sahara Wall
- Morocco
- Motte-and-bailey castle
- Mozambique
- Mughal Empire
- Murder-hole
- Myanmar
- National redoubt
- Nazi Germany
- Nepal
- Netherlands New Guinea
- New Scientist
- Nguyễn dynasty
- Nicaragua
- Nomadic empire
- Northern Cyprus
- North Korea
- Norway
- Nuraghe
- Offa's Dyke
- Oman
- Oppidum
- Ordensburg
- Ostrog
- Outer bailey
- Outpost
- Outwork
- Overseas province
- Overseas territory
- Pakistan
- Palanka
- Palas
- Palisade
- Panama
- Panama Canal Zone
- Paraguay
- Peace lines
- Peel tower
- Picket
- Pillbox
- Poland
- Politico
- Portcullis
- Portuguese Empire
- Portuguese India
- Portuguese Timor
- Postern
- Powder Tower
- Presidencies and provinces of British India
- Presidio
- Promontory fort
- Punji stick
- Qalat
- Qi
- Qing
- Qing dynasty
- Quadrangular castle
- Radio Free Europe/Radio Liberty
- Rampart
- Ravelin
- Redan
- Redoubt
- Reduit
- Republic of China
- Retrenchment
- Reuters
- Revetment
- Ribat
- Ricetto
- Ringfort
- Rocca
- Rock Castle
- Roman Britain
- Roman Empire
- Roundel
- Russia
- Russian Empire
- Russian Soviet Federative Socialist Republic
- Russia–Ukraine barrier
- Sakhalin Oblast
- Sally port
- Sandbag
- Sangar
- Saudi Arabia
- Schanze
- Schloss
- Sconce
- Second Sino-Japanese War
- Sentry gun
- Separation barrier
- Serbia
- Shell keep
- Shield wall
- Siege
- Siege engine
- Slovenia
- Smuggling
- South Africa
- South African Army
- South Africa–Zimbabwe border
- South Korea
- Soviet Union
- Spain
- Spider hole
- State of Palestine
- Station
- Stockade
- Submarine pen
- Sudis
- Syria
- Tenaille
- Territorial dispute
- Thailand
- The atlantic
- The independent
- The Irish Times
- Tower House
- Trench
- Trench warfare
- Tunisia
- Turkey
- Turkmenistan
- Turret
- Ukraine
- United Arab Emirates
- United Kingdom
- United Nations
- United Nations Command
- Urban guerrilla warfare
- Urban warfare
- USSR
- Uzbekistan
- Vallum
- Vedette
- Wagon fort
- Watchtower
- Water castle
- Wayback Machine
- Western Sahara
- Wire obstacle
- Witch tower
- Yagura
- Yemen
- Yett
- Zimbabwe
- Zwinger