I know that hooked feeling.....If you find coins that are the 60s and down there is a chance for silver.A visual indicator can be Very Large trees,Old buildings/structures....Waterways used to be a mode of travel back in the day..those are good spots.Train tracks can lead to older sites.Old parks..Schools also.You can Usually look at the school to get an idea of the age.Boy/Girl scout camps Are great(permission only Normally).Old homes ofcourse.Also over looked areas most people dont think to detect can Be the strips of Lawn between the sidwalk and street in cities/Towns.Now most Places dont have a problem with this,BUT its wise to check 1st if these strips are in front of peoples homes.If you do this be sure To leave no sign you were(Dig Careful).Old maps are a great way to find sites,Google earth can Help out alot too.There are alot of helpful people on the forum that will have many suggestions as well im sure.Good luck ,Have fun.HH