#stronghold__fastness  a strongly fortified defensive structure
  supertype:  #defensive_structure__defensivestructure__defense  a structure used for defense; "the artillery battered down the defenses"
  subtype:  #citadel__bastion  a stronghold into which people could go for shelter during a battle
     subtype:  #acropolis__acropoli  the citadel in ancient Greek towns
     subtype:  #kremlin  citadel of a Russian town
     subtype:  #Kremlin  citadel of Moscow, housing the offices of the Russian government
  subtype:  #blockhouse  a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire
  subtype:  #hold.stronghold  (archaic) a stronghold
  subtype:  #donjon__keep__dungeon  the main tower within the walls of a medieval castle or fortress
  subtype:  #redoubt__sconce  a forbidding stronghold

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