sanctum
noun
[ ˈsaŋ(k)təm ]
• a sacred place, especially a shrine within a temple or church.
• "an icon installed within the sanctum of the temple"
• a private place from which most people are excluded.
• "he ushered her into his sanctum and gave her something to drink"
Similar:
refuge,
retreat,
bolthole,
foxhole,
hideout,
hiding place,
hideaway,
study,
den,
querencia,
Origin:
late 16th century: from Latin, neuter of sanctus ‘holy’, from sancire ‘consecrate’.