noun
tomb
TOOM/tuːm/
A place or structure where a dead person is buried.
The tomb contains a sealed stone sarcophagus.

Etymology
Greek tymbos meant a mound, especially a burial mound, and also a grave. The burial-place meaning survives in tomb, including a chamber or structure housing the dead.
In context
There was a huge burial mound here. It was 110 meters in diameter and 13 meters high. Only a third of the tomb is sticking out. The main chamber is hidden underground.