Apple is about to reveal its $5 billion campus to the public - here's what you need to know

Apple will unveil its new iPhones next week, but the biggest reveal may be the company's new headquarters. 

Located in Cupertino, California, just down the freeway from its previous headquarters, the new building, dubbed Apple Park, is a single ring about a mile in circumference. It's set in a large campus that also features a massive fitness center and is landscaped with numerous plants and fruit trees.

Apple plans to generally restrict access to the campus to its employees. But next week, members of the press will visit the grounds to see CEO Tim Cook and company reveal the latest iPhones in the Steve Jobs Theater, Apple's new on-campus auditorium.

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Apple Park, which has been compared to a UFO and the Pentagon, contains more than 2.8 million square feet of office space, can accommodate some 12,000 employees and has a workspace that's been carefully overseen by Jony Ive, Apple's chief design officer.

Jobs, Apple's cofounder and former CEO, once said that the spaceship-like structure was Apple's "shot at building the best office building in the world." And after about $5 billion in costs, Apple's ready to show off its new campus to the public. 

Here's a look at how Apple Park was built: