Construction sites, Construction sites and more Construction sites. Do your research in your area, learn how to graciously ask for permission and wait for the windows of the past to be opened for you. Everytime a building is demolished, an old road is repaired, a sidewalk is redone, a lot is graded, etc., a window to the past is opened for you that has not seen a detector ever in most cases. It is one of the only ways that you can guarantee that you are the first to put a detector in that area. My best finds, including a two piece CS script Civll War Buckle, rated a 9 in rarity on a 10 scale, have come from construction sites.