The Randall Museum in San Francisco hosts a fairly large HO-scale model train layout.
Initially created by the Golden Gate Model Railroad Club started in 1961, the layout was donated to the Museum in 2015.

You will be redirected to the new Randall Museum Train Layout in a few seconds.
If you are not automatically redirected, please click here.

The old GGMRC page is no longer updated, however I keep the archives available for reference.