The current URL isn’t much of a museum. The internet archive only has redirects from the late 90s but the redirect actually has a museum linked on the homepage you can see it here: https://web.archive.org/web/19981206130746/http://home.brightware.com/~rwk/symbolics/

Saved you a click

Today, a quick visit to Symbolics.com will take you to what is essentially a web-based museum. In 2009, the domain was acquired by Aron Meystedt, a startup investor and founder of Napkin.com.