[aidenn0]

TIL the smithsonian removed it's Foucault pendulum in 1998 (right about when I moved away from the DC area). It was about 15 meters long and quite impressive; they had little pins setup that it would knock down, so you could look at when you arrived in the museum and see the difference when you left.

[redis_mlc]

The Oregon Convention Center has one, watched it every O'Reilly Open Source Conference that was in Portland.

https://www.youtube.com/watch?v=-p7P0DQvp0g

[saagarjha]

If you’re ever in the Bay, the California Academy of Sciences has one (although it’s probably one of the more boring exhibits there).