Just a few blocks east of USPTO headquarters lies one of the most fascinating collections of cemeteries you’ll ever find, filled with impressive headstones and dramatic personal stories. Our guide, David Heiby, will share this history from the 18th to the 20th century, discovered through firsthand research and fieldwork. The tour is $20 per person (admission fee of $30 minus a $10 PTOS subsidy) for a maximum of 25 PTOS members.