Memorable, enjoyable, and I want to go back for more! I had no idea what to expect, but my visit into the Williamson Tunnels on Mason Street far exceeded any expectations. This is not some polished visitor attraction, but rather a living, breathing ongoing archaeology project run by enthusiastic and very knowledgeable volunteers. I didn't have time to explore all the tunnels on this visit, but I will definitely be back for more. It's free to visit, and although I joined the Friends and made a donation, there's absolutely no pressure to do so.