Start with the page for The Robert and Deborah Aliber Persian Gallery and at the bottom you'll see all their other links, including one to their Catalog of Expedition Photographs. All these photographs were obviously taken before any extensive excavations or rebuilding had been done.
Here's some of the blurb on the gallery itself:
Hmm, I think I must try and get to Chicago one day as it's unlikely that I'll ever make it to Persepolis itself! (Yes, Marcus, I'm envious!)Roughly half of the Persian Gallery is devoted to artifacts from Persepolis, which thrived from approximately 520 B.C. until, in 331 B.C., Alexander the Great and his troops destroyed it. This portion of the gallery is dominated by a series of colossal sculptures made of polished, black limestone, including the head of a bull that once guarded the entrance to the Hundred-Column Hall and column capitals in the forms of bulls and composite creatures.
"We display plates from the royal tables, which were broken when Alexander destroyed the city. They were thrown against the walls and lay in the ruins until a team from the Oriental Institute recovered them," Wilson said.
Best regards,
Yep, Persepolis is the business, and I would go again like a shot (with a better camera next time). I'll be in Iran again at Easter, but this time only in Meshed for a couple of days, and Tehran for a couple more. I won't get back down to Shiraz (for Persepolis or Pasargadae).
You seem to be evolving into the Michael Wood of Pothos, only with a more accurate understanding of the historical Alexander and without the BBC cameras! I do hope you intend to write about these various trips one day soon. 
