Looks like I may need to give some hints. For anyone who wants to try again, I'll accept a second entry (a new comment).
Hint 1: three of @ajala 's guesses are correct and two are incorrect.
Hint 2: The location of photo # 1 is not in California.
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am thinking 3rd pic looks like the Deutsches Eck in Koblens but you're not in the EU so maybe not ?
oh darn I just saw your reply there above so that means all of them are in the US bummer hahaha