For Alabama - I may be biased, but I’d say the Saturn V rocket at the Space and Rocket Center in Huntsville. It’s just a model, but it’s full scale. (There’s also a “real” one - a Saturn V engineering test article - in a building next to it.) The center is best known for Space Camp.
Don’t forget the Goonies rock!
What? No love for Mt. Hood? 
If you’re going to Multnomah Falls you can’t miss Mt Hood, and assuming you fly in to PDX you’re gonna get a stellar view of it as well as it being omnipresent from most of Portland. It’s a nice mountain and all, but Jefferson is even prettier, to my mind.
Yea, I was standing under it just last week. It’s a sight to behold.
Arkansas. Me. Not really, I ain’t iconic, yet.
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In Murfreesboro there is a Diamond mine. You can go in and dig for your own. Muddy, hot and kids love it.
I was also thinking House on the Rock or that museum with the wings. Apostle Islands are really neat but not that well known outside the region. Honorable mention for Eagle Tower in Peninsula State Park (RIP), Yerkes observatory in Williams Bay, and the state capitol (or the Grant County courthouse)
For Minnesota – Split Rock Lighthouse? St Anthony Falls?
Brian
Ohio, mmm maybe rock n roll or football hall of fame .
Probably the Goodyear blimps really, but idk if people generally make the connection.
I think Mt. Jefferson is prettier, too. Hell, Broken Top is one of my favorites. But not iconic in the way Mt. Hood is.
Florida, here. I will NOT say the castle at Disney World (that could be Anaheim, right?); I’ll say the marker at Key West designating farthest point south, no mistaking that.
But is Hood iconic to Portland or to Oregon, really? I think more Portland–it’s our backdrop, but for the rest of the state not so much.
Steen’s Mountain is pretty impressive too but in a totally different way.
Oh, let’s not fight and agree it’s probably Crater Lake. 
Heceta Head lighthouse is the most photographed one in the world, at least according to a guy who works there.
Man, you took mine in the OP. 
So I will just add a line I stole from a St. Louis Post Dispatch columnist, in reference to the Arch: “St. Louis is the only town in the world that built a monument to the people who left.” 
I actually love St. Louis, but that line is still pretty funny.
^ Indeed! I’m surprised Kathleen Madigan didn’t think it up.
Can’t really think of anything iconic for Kansas. Big flat corn and wheat fields? The “Welcome to Colorado” sign at the end?
I read it in a Bill McClellan column, probably in the mid 90s. Maybe he got it from her.
The “Welcome to Las Vegas” sign, of course.
I would agree with the Golden Gate and the Hollywood sign. While Yosemite is full of utterly breathtaking views, when you say the name there’s no clear iconic image that comes to mind. Not so with the other two.
Wait! What about the place where the boats sail off the edge of the world? Own it, man!