When I lived in AZ I found a bunch of old mining and pioneer stuff. Glass Clorox bottle from the '20s, pick and ax heads, abandoned mine shafts, steam or horse-powered equipment left to rust, stuff like that. It was close to the border so a lot of smuggling-related trash, trashed/torched/shot-up stolen trucks, etc. No drugs or guns or cash or dead aliens.
Where I used to hunt on the North Shore I found a really nice old brush blind on a ridgeline overlooking a sort of bowl. Folding chair tucked in to a small spruce copse, with branches trimmed to hide the hunter. It was a bit overgrown so I was sure it hadn't been hunted in a while. Did some fresh trimming and sat in it a few times, but never shot anything from it. Also found some old foundations.
A few years back I got drawn for a city hunt. Never saw a deer but stumbled across a small-time cannabis grow. Not legal in MN, doubly so because it was on posted airport property. Called a guy I know on the local dope squad and after a short deliberation ("Do we want to seize this now, or work it and catch the guy later?") I helped haul all the plants (and trail cameras and fertilizer and whatnot) to his truck.