noun
treasury; treasure house; storehouse
A physical or metaphorical place where valuable things are stored or concentrated.
この博物館は古代美術の宝庫だ。
This museum is a treasure house of ancient art.
noun
treasure trove; rich source
Often used figuratively for a place, person, or thing that is an abundant source of something valuable, such as information, resources, or talent.
インターネットは情報の宝庫です。
The internet is a treasure trove of information.
彼の頭の中はアイデアの宝庫だ。
His mind is a rich source of ideas.