Sunday Journal, "A view with walls down"

I was visiting Philadelphia this Sunday, where the first president of USA (George Washington) lived. Recent diggings have shown his residence complex showing the slave quarters (for 9 of them) who had a 'herculian' job of maintining his house and guests (Hercules was the name of the slave who was an extraordinary culinary expert we are told) entertained properly, the SLAVES WITH THEIR OWN (HIDDEN) PASSAGE for access to the president's living area, SO THAT THEY ARE NOT SEEN by visitors etc.
A lot of comments what to do about that digging now, showing two parts of the house, "the Powerful" and "the powerless" as somebody remarked. The stark difference exposed of a view with walls down, making many passing by 'blacks' see it as well as many whites passing by seeing it and wondering and pondering.
'Ibrat' (Arabic 'Ibrah'), for everybody--- closest English equivalent is 'admonition' or a lesson for the person watching. Reminded me of "Pompei Ruins" I had visited several years ago where I noted two things, preserved in my memory:
1. The petrified body of a man (recognised as slave) preserved, showing the horror of the disaster on his face. (my eyes popped open)
2. A small resevoir of water in the market area street with the remarks,
"For animals and slaves". (my eyes popped open)
Over the years does history of mankind really change?