Some of our colleagues have been mapping at Congressional Cemetery today. A great number of features have been added to OpenStreetMap, which is fantastic.
However, some grave sites have been tagged like:
wikipedia = en.wikipedia.org/wiki/Alexander_Dallas_Bache
That should be formatted as:
wikipedia = en:Alexander Dallas Bache
per http://wiki.openstreetmap.org/wiki/Wikipedia.
I trust that's useful. I've fixed most of them.
BTW, it would also be good to get burial-place coordinates into the respective Wikipedia articles.