Discussed (only?) once before:

The Interim Computer Museum - https://news.ycombinator.com/item?id=37304983 - Aug 2023 (15 comments)

ICM on a Saturday and Connections Museum on a Sunday is a delightful pairing! Close to the airport too if your just popping by on a layover, though plan on 2 to 4 hours for each

A fantastic collection and restoration effort. I highly encourage a visit. I was in Seattle last year and had recently joined and pinged about maybe getting a tour. It was right before a vintage computer festival and despite being busy getting ready, Stephen, the director, encouraged me to drop in.

I would've been happy just looking (and not even touching) by myself for 15 or 20 minutes given the circumstances, but Stephen spent 1.5 hours with me in a hands-on tour, including playing Spacewar. He genuinely cares about these machines, their preservation, and spreading enthusiasm about them. I only wish I was a little closer (3 hours away in Portland) or I'd spend more time on-site helping with the effort.