Lair

lair1
/ler/
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noun
noun: lair; plural noun: lairs

a wild animal's resting place, especially one that is well hidden.
"the badgers carried the food back to their lair"
synonyms: den, burrow, hole, lie, covert, tunnel, dugout, hollow, cave, haunt
"the lair of a large python"
a secret or private place in which a person seeks concealment or seclusion.
"he led the police to the criminals' lair"
synonyms: hideaway, hiding place, hideout, refuge, sanctuary, haven, cache, shelter, retreat; informalhidey-hole
"the lair of a villain"

Origin