It depends on which time you are there. The first time (which is my guess) you need to make your way to the Rotunda and you will eventually find a set of notes from James, where you need to read through them to discover where he went.
To find the Jefferson Memorial, head to Rivet City first. From there, head towards the river, and look across at the far bank. Once you are here, look to the right, and you should see an island with a dome roofed building. This building is the Jefferson Memorial.
It is near the Jefferson Memorial.
The Jefferson Memorial and in parts of the Capital Wasteland. http://fallout.wikia.com/wiki/Fallout_3_map
As Fallout 3 players will know, it was in the Jefferson Memorial, Washington D.C, made by the Lone Wanderer's father
Thier are simply to many to count but i will give you a couple any ways. One place is in Sergrave Holmes home in rivert city. Another is in the Jefferson memorial on top of the thing you would place the virus into. The last is in an area in Jefferson memorial that you find whil exploring.
well it cant be fxed but its problably that your disc is either dusty or scratched
Perhaps you download The Pitt when you were on the last quest and then you have not finished, I will not put any Spoilers, but you cannot continue after this
travel east from Anchorage memorial.
3 million
There are no Mounts in the unmodified version of Fallout 3.
There is no more a master key in Fallout 3.
Heh. You had that problem too, Huh?. Lyons is blocking the way. Just run up to her and keep running to push her out of the way. there shold be a control panel there.
You can find President Eden in Fallout 3 at Raven Rock, but he is also a computer!