Many of the older stones were eroded by acid rain, and are difficult to make out, but there's a great deal of what is essentially public artwork honoring the memory of people you've never heard of (and some you have). I gather that the Winter mausoleum is the most famous. Winter copied the design of the Woolworth mausoleum: a pseudo-Egyptian temple with busty Greek-style sphynxes and heiroglyphs that mixed real phrases and gibberish, and doors showing the proprietor being aided by de-animal-headed Egyptian gods.
Many of the mausoleums have stained glass within, which you can view through the front door's grating--Winter's has 3 panels. Oddly, even the good Father Pitt/Dr Boli only mentioned one of them--which shows Winter as Pharoah enthroned. Modesty seems not to have been Emil Winter's most prominent virtue.
Yes, the noses of the bronze figures on the door show signs that visitors have been rubbing them, and the snooty sphynxes show similar signs, though not on the nose.
It isn't just rich businessmen who are buried in the cemetery, of course, a friend and confidant "of the illustrious Washington" is also buried there. Daniel O'Niell's statue shows him still at his editor's desk, and the (presumably recopied) stones for Ebenezer Denny and his wife Nany Denny ("Stop, Passenger! and here view whatever is admirable summed up in the character of Mrs. Nancy Denny...") tell of older ways of memorializing.
Many plots had a little walled flower garden above the grave--sometimes a painfully small grave with small numbers on the stone. Once there was a fashion for headstones shaped like scrolls, which, combined with the flower-garden cavity gives the impression of a giant sardine can being opened with a rolling key.
Karl Lennart Gronros from Finland had a stone paid for by his friends so that all would know that the 24-year-old was a mechanical engineer.
It is a bit disconcerting to see so many headstones for people younger than me.