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Hide a Safe in the Wall or Floor
Install a wall hidden safe or cylinder floor safe by bolting it to the floor (most hidden safes have holes inside for just that purpose). Hide it in the corner of a closet or other inconspicuous area. Or mount the wall safe inside a wall and cover it with a picture. Or chip out a hole in your concrete slab and stick in the floor hidden safe, then pour new concrete around it.
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False Top (or Bottom)
When you build a piece of furniture, build in a stash spot. For example, when you assemble a dresser, put a piece of 1/4-in. plywood just above the top drawers and install a piano hinge on the top. Now you have a spot to hide precious items.