Found one this week only because my 13 year old son went along. GPSr took me to the middle of a parking lot. Nothing there but 3 light poles mounted on concrete bases. The poles and bases had no holes, boxes or anything. My son fiddled with a metal fender at the base of the pole, where the pole attached to the concrete base. He discovered that the metal fender moved. He then dsicovered that the fender would "slide up," revealing an area where the micro was hidden underneath the bolts that held the pole to the concrete base. Lesson: fiddle with stuff.
Found another where there were all these manmade spaces to hid the micro. The micro was in fact hidden in an open knot on the tree branch hanging over the manmade features. Lesson: don't assume the cache is hidden in either manmade or natural features; look at all.
Be devious in your thinking!
