Interlisp/Medley has sort of revived as an application that runs on your computer: https://interlisp.org/

There’s also Mezzano which is a relatively new, from scratch Common Lisp implementation on bare metal: https://github.com/froggey/Mezzano

Finally, if you know where to look, it’s possible to setup a Symbolics VM on Linux, which is somewhat interesting to poke around in (all the manuals available out of the box are pretty interesting to read through.)