Which classic Disneyland attraction was NOT running on opening day in 1955?

Which classic Disneyland attraction was NOT running on opening day in 1955?
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One of my favorite parts of Disneyland is that you can still get those opening day vibes, especially when you visit some of the old-school rides that have preserved much of their original charm — even after decades of refurbishments and small updates.

There are some truly iconic attractions that have been there literally since day one — you'd think this was one of them, but you're dead wrong. Which one was NOT there on that fateful day in July of 1955?

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