There is a visitor center for the Grand Coulee dam.  Sadly, as with a lot of similar things, it was closed while I was there due to the virus.  While I couldn’t go in, I was rather taken with the structure itself.  I’m not sure when it was built but it has a bit of a 70s space age feel about it.  When in the park lower down the hill, it looks a little like a flying saucer has landed above you.  I bet it looks interesting when lit up at night.