When you enter the utility tunnel, there is a workbench and an ophthalmoscope in a side room to the right. To get to the White House, take the first left, follow the corridor, and you will eventually find a door to the left that opens onto the ruin-filled radioactive pit that the White House has become. To reach the sub level in Broken Steel, keep following that corridor until you see a door on the right.
There are two ramps set up on either side of a car and the remains of a daredevil trying to keep himself entertained after the bombs fell. You can see on one side the crashed motorcycle and the top half of the daredevil hanging from the light fixture above the car. However, it is possible for the skeleton to have fallen down and be lying on the car instead.