Okay this might seem weird, but most of those memories/images are like dreams in the morning. I forget most of them, but I remember a few.
1. Tropical island, not sure when but no modern technology
2. Prehistoric times, group of hunters
3. Japan or China, definitely Asia
Can't remember the rest now, but I can tell you this: when I have one of those memories/visions I feel a sense of recognition.
This mostly happens when I'm doing nothing or not much.