Ghostly Whispering voices from the Burial mounds .I have not checked them all out
Fallout New Vegas Go to settings. Gameplay Audio and; Turn off the, Radio, Footsteps and Music. Turn up the, master, voice and effects.
Voices and mutterings may be heard continously while walking around the grave yard at Camp Forlorn Hope.
From Opening up burial mounds with Shovel and listening.
The two graves at Canyon Wreckage. The Graves or the Grave yard at Goodspings Cemetery . The three graves above Nipton Road Rest Stop. Chances grave. Wolfhorn Ranch grave. Bitter Springs graves. Northern passage.