How can I travel to another place

Hint 1 of 6:

You can't unless you find money in Sanctuary.

Hint 2 of 6:

Did you MOVE PAINTING above the Doctor's file cabinet ?  +1

Hint 3 of 6:

LOOK WRITING revealed on the wall ?    +1

Hint 4 of 6:

Have you found the Doctor's safe ?

Hint 5 of 6:

MOVE BOOKS on 2nd shelf (from top) of bookcase.  +1