Something to check out in dc

Walking up through Rock Creek Park today, we found an interesting historical landmark and wandered around to find the entranced at 27th and Q streets for the Mount Zion Cemetery. It was the first (or one of the first) cemeteries for free blacks in the district. The cemetery of 3 acres of rolling hills is open to the public monday-friday from 9 to 4. 

Here is a little description I've found:

http://www.nps.gov/nr/travel/wash/dc10.htm

It might be a perfect place to plan a picnic - I've heard that dinning along the deceased is pretty common in other cultures.