If in Edinburgh try to see the underground dwellings which may be of interest . Have fun
I think Guardsman is referring to Mary King's Close. Old buildings which were partially demolished and the lower floors remained to form the foundations for what is now the Edinburgh City Chambers. The lower floors of the house, and the old streets are still there, just as they were at the time when they were covered over by the new buildings more than two hundred years ago. There are guided tours beneath the floors of the City Chambers where you can visit the old houses and see how people lived in Edinburgh in bygone times. Well worth a visit.
http://www.realmarykingsclose.com/