Tim Cook explains why you're never going to visit the inside of Apple's new 5 billion headquarters AAPL

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Apple just finished a 5 billion headquarters called Apple Park. Some say it's an architectural landmark.

Non-Apple employees are not allowed in, though, and Apple's not likely to offer tours.

It's because there's a lot of confidential information inside the building, Apple CEO Tim Cook said.

Shareholders at Apple's annual meeting on Tuesday got to experience the new Steve Jobs Theater on Apple's recently opened 5 billion campus, Apple Park, but they didn't get to see inside the main "spaceship" building.

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