In the summer of 2005, I attempted to locate the site of the pumpkin patch where Whittaker Chambers hid the microfilms that helped to bring down Hiss. Although I couldn’t be certain of the actual site, the general area is a rural, wooded valley in the rolling hills just north of Westminster, Md.
Google “pumpkin patch” + Chambers and click on the link headlined Westminster. This is a story in the Westminster Eagle, dated April 15, which incudes an embedded link to a PDF map showing the Chambers farm.