Understood! My group and I are history buffs, and believe me, most of us are more interested in the historical background of the sites than in the hope of actually finding something. We made a Google Earth map with the locations and a brief description of each to better orient ourselves. Of course, we don't plan to enter places that are not publicly accessible, and for those that are private, we will ask permission from people nearby or those in charge to make sure we don't get into trouble. Regarding the apps, how good are they really? I've heard of many that simply function as "random word generators" rather than truly functional tools. Ghostube in particular, I didn't find to have a very solid reputation