Lincoln is actually buried below this vault while his wife (Mary) and three children (Tad, Eddie and Willie) are buried in the wall behind where I stood to take this picture.
Below is shown the actual receiving vault where Lincoln's body was buried in 1865. It's just down the hill from the current tomb. Looking back to photos from then, the vault is unchanged.
We returned home on Sunday, June 1. It wasn't enough time to really see it all so I'll probably return some day for a third trip.