Cities are constantly changing, constantly under construction, constantly moving forward. But if you know how and where to look, and if you look carefully, much of the past is waiting to be rediscovered beneath the facade of progress. Dan Tobyne leads readers on a contemporary archaeological tour of Boston, revealing fascinating aspects of the city's history through what remains of old buildings, structures, streets, and even such mundane objects as manhole covers, callboxes, and trash cans.