Grayditch is a desserted town southeast of Megaton near the Super Duper Mart. It is home to many fire ants. The town is largely destroyed with various buildings that you can enter, each with varying amounts of loot. There is also a locked dumpster which you can get the key for from the same boy who starts the town-related quest. Notable places in Grayditch are the Metro tunnel, Shack, Diner and fallout shelter.
Those!: Received from a boy who approaches you when you are in an area near Grayditch such as the Super Duper Mart. A rather hard quest in the end for lower level players, but it does result in the option of +1 strength or perception via perks. Might want to be around level 10 for this one.