This is the exclusive Apple merchandise you can only get at its Silicon Valley campus

Apple's legendary Cupertino, California, campus isn't especially hospitable to unwanted visitors, as you might expect from a company famous for its secrecy.

There's really only one place on the Apple campus that welcomes visitors: A small Apple Store, located right at 1 Infinite Loop, and open to the public.

Mostly, it's nothing special among the 463 Apple Stores in the world - wooden tables, lots of glass, and a Genius Bar.

But in addition to the standard selection of Apple gadgets, it's the only place anywhere on earth where you can buy a special selection of official Apple merchandise.

I stopped by the Apple Store at the company's headquarters, $4, to take a look and shop around. Here's what I found: