Squidward's House: Big Easter Island Head
Wadena, Iowa
Nowhere near the bottom of the sea, this 25-foot-high Easter Island Head is modeled on Squidward's house from the SpongeBob SquarePants universe. It stands on someone's front lawn and has a wooden front door, although it's unlikely that any person or mollusk lives inside.
Why is this here? Well, perhaps it's because the head/house sits on the outskirts of Wadena, Iowa; and there's a Wadena County, Minnesota, that has a ghost town named Shell City; and there's a Shell City in The SpongeBob SquarePants Movie.
That may not be much of a connection, but it's the best that we could come up with.