On at least 11 separate occassions I have found objects I knew to be there, all of them ancient artifacts, simply by knowing they would be there. I didn't know exactly what they would be except they would be artifacts.
EX. While driving down the road I became aware of something in the river a mile or so away, I told the person I was with there was an artifact over there and left the freeway, traveled down a service road, parked and told this person it was right over there.