random old photos found in photo library

i was randomly looking through my photos when i noticed six new photos, all of which were from before i had a phone. three were in random nature landscapes in iceland, one was in scotland, one was a picture of a group of flowers in san fransisco, and one was just a picture of some leaves without a location. the dates ranged from 2009 to 2018, three of which were from before iphone existed. my icloud is only my devices and i have not downloaded any images like this. could someone help me figure out why these are here? (i considered deleting them but it's not every day that you get a picture from 2009 on an iphone.)