When we arrived at Kilmainham Gaol Museum on the west side of Dublin, we were greeted at a big imposing door by a stout-looking Irish man with grey hair. He looked at me and with all seriousness said, “Ah! I see you’ve brought us some long-term guests!” My kids stared at the man and then slowly looked at me like, “He’s joking, right mom? RIGHT?!?!” Have I mentioned that Kilmainham Gaol is a prison? Technically, it WAS a prison. Kilmainham Gaol opened in 1796 on a site known as Gallows Hill. If that doesn’t set the stage for an 18th century prison, I don’t know what does. WHY YOU SHOULD…