Arlington National Cemetery
Green-Wood Cemetery [NY]
St. Pauls Chapel [NY] did a drive by but they wouldn't stop :(
Those are just a few I can think of off the top of my head. I would be interested in knowing what cemeteries are on your bucket list or you think should be on mine.
For anyone in the Columbus, GA area [100 miles sw of Atlanta - on the Alabama border - on the Chattahoochee River] you must see the historic Linwood Cemetery. It takes days to take it all in. This is my hometown and I am soooooo sorry I did not have a love of cemeteries when I lived there. The eastern states have some of the most wonderful cemeteries. I am hoping to make another visit this year as soon as the weather cools down a bit. Oh, and see family while there too! ;) The photo at the top of my blog was taken at Linwood.
Another is the Sleepy Hollow Cemetery in Tarrytown, NY. I didn't get enough time [do we ever?] to really explore like I wanted to but I feel in love [is that weird?] with it. I do hope to go again next year if possible.