The masons are just a bunch of old men who get together to hang out and sometimes do charity work. They aren’t evil or really that mysterious. If you go to a lodge and ask for a tour they’ll likely show you around. They’re basically just weird churches. The one I’ve been to just had a large hall for ceremonies and a few other rooms. The foyer had a very large bible under glass IIRC, but its been more than a decade since then. They’re basically dying out because young people want nothing to do with that crap.