“Maybe that's why you've come, too - need to see where the missile from Ashton touched ground down below, in Hopeville... the Courier's Mile.”— Ulysses
The path to the Courier's Mile is a location in the Divide.
Located directly under the Hopeville missile silo bunker, it is comprised of a street with an invisible wall hindering forward movement, and acts as the "door" to the Courier's Mile. The map marker for the location appears after The Launch is completed.
The path to the Courier's Mile appears only in the Fallout: New Vegas add-on Lonesome Road.
Hopeville from the Courier's Mile entrance