Tomb 
To dream about tombs represents things about you that you have kept secret.
To dream about seeing your own tomb indicates that you are preparing to explore parts of yourself that have long been dormant.
Vault
To dream of a vault indicates a threat against your wealth and financial stability. There are people around you that may attempt to use charm or fraud to take it from you. It may also indicate your inner 'safe,' or the place where you keep your inner potential. When you dream of the safe, you need to consider looking at your true potential and putting it to good use.
To see an open vault is an indication that you may be rubbing your money in the noses of others.
To see a burial vault represents the personal sadness and grief you have experienced as a loved one passed away.
Grave
To dream that you are visiting a grave suggests that you have a long-buried issue that needs to be addressed. You should defend yourself as there is no one who will do it for you. This dream may also indicate that some event or situation will be finished in your life. You are anticipating a fresh beginning.
To dream that you are digging a grave represents that you are anxious about a new task.
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