Try this website: http://www.ushistory.org/franklin/court/index.htm and look at Franklin Court, the site where Benjamin Franklin's house in Philadelphia stood:
"In the court itself once stood his house. What is known of the house is that it was 3 stories high, covered 33 feet square, and included 10 rooms. The house was razed in 1812. Because no historical records of the look of the exterior exist, the space once occupied by the house is marked by a wonderful, oversized "Ghost Structure" designed by world-famous architect Robert Venturi and built in 1976 for the bicentennial. You can look through portals to see into Franklin's privy pits, wells, and foundation. An extremely rare Bristol punchbowl and other ceramic artifacts were found in the privy pit."
For a view of the "Ghost Structure" and more information go to http://www.nps.gov/inde/franklin-court.html
Margaret Lyman, Collections Manager, Mutter Museum, Philadelphia, PA
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