For most of my life, I had no idea the Barnes Foundation existed. For the most part, or at least, as far as I can tell, if you’re not from the Philadelphia area and/or are not an art historian/uber-enthusiast, you probably have never heard of the Barnes Foundation either.
It's a shame, really, because the Barnes Foundation is home to one of the most significant collections of art in the United States, if not the world. Wait, let me pull from the Barnes Foundation website so I can get it JUST right:
“An extraordinary number of masterpieces by Renoir, Cézanne and Matisse provide a depth of work by these artists unavailable elsewhere.” -- Barnes Foundation Website (link below)