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The Day 1 building must be Amazon's spiritual HQ since the 'Day 1' concept is such an important part of Amazon's lore. This location is also well known for it's Amazon Spheres structure filled with plant life from around the world. Amazon offers periodic weekend tours of the facility, and you need to make sure you sign up there. The other way to get a tour is to ask an Amazon employee. They can bring guests in. We took a tour and it was definitely worth it. If you can't get into the Spheres, there is always the 'Understory' - which although kind of boring - is a public facing explanation of the project.