A few miles off Interstate 270, in the heart of bustling Montgomery County, a once-thriving neighborhood has taken on the feel of a ghost town. Half the homes are vacant, their windows broken or boarded up. Driveways are strewed with debris. "No Trespassing" and "Beware of Dog" signs dot trees. Banging sounds come from empty houses where burglars pry copper pipes from the walls. The culprit is not foreclosure but the imminent arrival of the six-lane intercounty connector that will slice through the Derwood neighborhood. This week, highway workers demolished a brick house and will soon raze five more on...