A tomb was a long-term storage place for the remains of the dead.
When Barbara Wright left the tomb of Yetaxa after the TARDIS landed inside it, the Aztecs thought she was a reincarnation of Yetaxa. (TV: The Aztecs)
An archaeological expedition went to Telos in the 25th century to find the tombs of the Cybermen. However, the Cybermen were not dead, but in suspended animation. (TV: The Tomb of the Cybermen) Nonetheless, Cyber-tombs and Tomb worlds were common terms referring to any facility or planet hosting sleeping Cybermen. (TV: Attack of the Cybermen et al.)
Borusa sent five incarnations of the Doctor to the Death Zone to clear the way for him to get into the Tomb of Rassilon. (TV: The Five Doctors)
In an alternate future, the Doctor's tomb on Trenzalore was his decaying TARDIS. (TV: The Name of the Doctor)
In the 1924, River Song and Bertie Potts found themselves imprisoned in an underground tomb in Mesopotamia, haunted with alien saline drones. (AUDIO: The Boundless Sea)