treasure trove /-ˌtrov/
  地財,貴重的發現物
  treasure trove
       n 1: treasure of unknown ownership found hidden (usually in the
            earth) [syn: trove]
       2: any collection of valuables that is discovered; "her book
          was a treasure trove of new ideas"; "mother's attic was a
          treasure trove when we were looking for antiques"