The Hub is simply downtown Boston. It's not an exact location, but if you wanted to use the square formed by the Gov't Center, Park St., State, and Downtown Crossing T stops, you'd have a working model--I imagine the thickest part of the corporate sprawl extends south and west from this, towards Boylston and absorbing the Bay Village. Revere is where it is today: just up the coast from Eastie (East Boston).