Apple fans and architecture buffs alike have been following the development of the company's new global headquarters since renderings were first unveiled in 2011. Following updated plans and a subsequent final approval by the Cupertino Ctiy Council, Apple's Campus 2 -- aka the spaceship -- is further revealed through a spate of new renderings that takes the observer inside the 2.8 million square-foot structure. Designed by star architect Norman Foster of Foster + Partners, the mothership sits on a grassy 176-acre plot in the South Bay, its four stories set to be the new home for 13,000 engineers and designers. Make no mistake, the futuristic donut-shaped facility is the crown jewel of the plan, but the campus also includes a research and development building, 1000-seat auditorium accessible by a glass pavilion, and a generating plant that will serve as the campus' primary source of electricity. Check out the new renderings below.