Here are some updated photos on the ancient coins I dug up. Sorry for any confusion with the photo quality and stuff like that. Thanks guys I'm trying to learn as much as possible!
That last one is a "potin" (cheapo copper alloy containing a minimal amount of silver) tetradrachm of Aurelian, who reigned from 270-275. It's strange that you found it in Europe, as they were only legal tender in Egypt. Do you recall where you found it?
Gallienus, 253-268 AD. Roman Æ Antoninianus, 2.26 g, 16.4 mm, 5 h. Rome Mint 267-268 AD. Obv: GALLIENVS AVG, radiate head right. Rev: DIANAE CONS AVG, gazelle walking left, XII in exergue. Refs: RIC 181; Cohen 165; RCV 10200; Göbl 750b.
Yes I do think that is strange as well. I found it on the Border of Munich, Germany, in the farm fields that lay right outside the city. there was a lot of activity over there by Romans in ancient times, and Nazis in WW11.