treasure trove
[noun]
Synonyms: find, treasure, bonanza, eldorado, Golconda, gold mine, mine, treasure-house, treasury

[TahlilGaran] English Synonym Dictionary ▲

treasure trove /ˈtreʒə trəʊv $ -ʒər troʊv/ noun [uncountable]
[Date: 1500-1600; Language: Anglo-French; Origin: tresor trové 'found treasure']

1. a group of valuable or interesting things or pieces of information, or the place where they are
treasure trove of
Our Science Shop is a treasure trove of curiosities and gadgets.

2. British English law valuable objects, coins etc that are found where they have been hidden or buried, which are not claimed by anyone

[TahlilGaran] Dictionary of Contemporary English ▲