Allegheny Cemetery and Egyptian Avenue are 2 examples). This one ranks up there among the most charming that I've visited.
The hand chiseled calligraphy on most is astounding in this age of machine-age engraving. It's interesting to see how the different stones have aged over time: marble, granite, sandstone, etc.
If you can find the time in your schedule to align with the cemeteries open hours I highly suggest a visit! Information on the Oak Hill Cemetery website.