This book contains three tours. The first is of four buildings by H.H. Richardson, the American master architect, in the Copley Square area in Boston. With about a tenth of Richardson's surviving buildings on display, Copley Square is a permanent blockbuster exhibition. The second tour is of five buildings in the Harvard Square area in Cambridge. Three are by Richardson, one in brick, one in stone, and one in wood. Two buildings pay tribute to Richardson's work. Four of the five buildings are at Harvard University, Richardson's alma mater. The third is not a walking tour or entirely a tour of existing buildings. It is a rolling tour, on a train, largely of buildings that no longer stand. Richardson designed four stations on what is now the Green Line of the Massachusetts Bay Transportation Authority.