stronghold

Synonyms:

fastness

Examples:

Black Hole of Calcutta

a dungeon (20 feet square) in a fort in Calcutta where as many as 146 English prisoners were held overnight by Siraj-ud-daula; the next morning only 23 were still alive

Kremlin

citadel of Moscow, housing the offices of the Russian government

Types:

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bastion, citadel

a stronghold into which people could go for shelter during a battle

blockhouse

a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire

hold

a stronghold

donjon, dungeon, keep

the main tower within the walls of a medieval castle or fortress

redoubt

an entrenched stronghold or refuge

acropolis

the citadel in ancient Greek towns

kremlin

citadel of a Russian town

Type of:

defence, defense, defensive structure

a structure used to defend against attack