treasure house; treasure room; storage for valuables
A room or building where treasures or valuable items are stored. Often used literally, but can also appear in metaphorical contexts (e.g., a museum as a treasure house of art).
Valuable works of art are kept in the museum's treasure house.
This library is a treasure house of knowledge.
Compound of 宝物 (treasure) + 庫 (storehouse). The reading is standard on'yomi.