The Arlington Cemetery is the cemetery in Virginia where Al Simmons is buried after his untimely death in Botswana. In Issue #16, Spawn digs up his grave to see if there is anything buried in his coffin. We soon find out that there is indeed the skeletal remains of Al Simmons, which means Spawn's now physical form is not that of Simmons'.
This cemetery is also the setting for Spawn's first encounter with Anti-Spawn.