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GC5GT6J at the Seattle Museum of Flight is one of the only caches in the world that has the "partnership cache" attribute
(sh.itjust.works)
This is one item I was thrilled to strike off my 'obscure stats' bucket list this year, and the museum itself was a great time as well
Haven't been yet, but being right next to Boeing's main plant, you better believe it looks cool.
Hell, it's so big you can see the museum as your plane comes in for a landing at SeaTac.