riznica

1. treasury; treasure house
   Manastirska riznica čuva stare ikone i rukopise. — The monastery treasury holds old icons and manuscripts.
2. (figurative) treasure trove; storehouse
   Ova knjiga je prava riznica narodnih priča. — This book is a real treasure trove of folk tales.
   Moj deda je bio riznica znanja. — My grandfather was a storehouse of knowledge.
3. (of a state) treasury; exchequer
   Novac od poreza se sliva u državnu riznicu. — Tax money flows into the state treasury.

A partial false friend for Russian speakers: riznica usually means a treasury or treasure house, including those of monasteries and museums; in church contexts it can correspond to Russian «ризница». Sakristija means a sacristy, especially in a Catholic church.