Bronze age axe head, one of my friends who has sadly past away found 4 or 5 and also half a bronze age sword. The more time you put in and more ground you cover the more likely you are to find something good.
Seen hammered coins, Roman coins, gold coins, sword pomells, viking silver, a Hitler youth dagger, Roman sling shots, lots of different stuff.
I feel like Europe would offer way better finds than the US. I've only ever used one to locate electric lines, but i definitely can't imagine discovering any of your impressive finds in the USA especially where I'm at in the Midwest
Nothing valuable, but I discovered a cache of Matchbox cars, coins, spoons, and small plastic toys all in a small spot in my yard when I first moved in. Seemed cool imaging the kids playing there years prior. Building tunnels in the dirt to drive their cars through and accidentally burying them for me to find later.