We saw a few House of Hades tiles in Philadelphia and several in New York. These appear to be the contemporary successor to Toynbee Tiles. Well, the sharp eyes and research skills of Mrs. C. found a reference to one in downtown St. Louis. It's at 7th and Olive Streets in front of Macy's, a block from my office. I walk through that intersection frequently and I am embarrassed that I have not noticed it. It is a bit out of the crosswalk, though.