Imagery in "Because I could not stop for Death"

In her poem "Because I could not stop for Death," Emily Dickinson uses great imagery to show the reader her depiction of death coming to retrieve her and her carriage ride to her tomb.   I think the following lines best show her effective use of imagery:

"We paused before a house that seemed

A swelling of the ground;

The roof was scarcely visible,

The cornice but a mound." 

When I read these lines I immediately picture the burial tombs that were used long ago in the British Isles.  They look like hills that are completely covered with grass.  You would never know they were tombs if you couldn't see the entrances.  It seems to me that she may be referring to these in her lines when she writes, "The roof was scarcely visible, / the cornice but a mound."  Furthermore, in her comparison where death is a carriage ride, it would not be unusual for a "house" to really be a tomb. 

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