The Hopeville silo bunker entrance is a location in the Divide in the Fallout: New Vegas add-on Lonesome Road. It leads to the Hopeville missile silo bunker which is part of the Hopeville Missile Base, which was operated by the Ballistic Defense Division of the Commonwealth Defense Administration.
After reaching the end of the pass to canyon wreckage, there is the Hopeville silo bunker entrance which leads to the Hopeville missile silo. The Hopeville missile silo is a large facility, extending all the way on the other side of the map.
Given the solid construction of an ICBM bunker, coupled with its construction inside of a mountain, the entire facility has an alarming tilt, likely caused by the massive upheaval of the Divide's formation.