There's some underground sections to explore there, I think I also found a unique suit of power armor called the medic there; wasn't anything special though.
Where are you at in the game?
Yeah, I cleared all of the tunnels and snagged everything, but, the Deathclaws respawn after a few days pass up there.
I am starting to infiltrate the D.C. city areas after already exploring every thing except the SE quadrant of the world map. I only have about 2 active, optional quests left that I haven't completed (Nuka Cola Challenge and rescue the kid from the Family).
ETA: Where in the hell is "The Family" located, BTW?