Hollowed-Out Rock (Fallout 3)

The Hollowed Out Rock is a secret stash where you can obtain a Sniper Rifle and various bits and bobs.

Location
The location is just around the back of Megaton



it is probably a nod to Morrowind expansion Bloodmoon, were the player could find a hollowed out stump behind Thrisk

Map
The Hollowed Out Rock does not have a map marker or any indication whatsoever on the Pip-Boy 3000.