Yes, Philadelphia once had a wax museum, and fortunately it was AIR CONDITIONED! The wax figures never would have survived a summer in The City of Brotherly Love if it wasn’t!
This was an ad from a playbill for the Valley Forge Music Fair’s 1967 season. I don’t have an recollection of the American Wax Museum. I don’t remember hearing ads for it on radio or television. My guess is that the wax works had shuffled off of this mortal coil by the time I was taking field trips in school. I searched a round the internet and came up dry.