The intersection of Lee and Grant in the city of Manassas. Interestingly enough, they're diametrically opposed streets and signs.
Lee was a military advisor to CSA President Jefferson Davis during First Manassas but commanded the forces in the Battle of Second Manassas. (Both battles were Confederate victories. Some say that 2nd Manassas was Lee's greatest military victory.)
Grant meanwhile was busy in the western theater of the War and nowhere round either of these Manassas Battles.