Discover a little-known part of Boston on this walk along the "Lost Half-Mile" of the Charles River, between the Charles River Dam Bridge and the North Washington Street Bridge. Boston University City Planning Professor Jim O'Connell will lead the tour of the area, also known as the New Charles River Basin. The tour will explore the 1910 Charles River Dam & the Museum of Science Park, burgeoning Cambridge Crossing/North Point development area, handsomely landscaped North Point Park, the underside of the Zakim Bridge, Charlestown's Paul Revere Park (where Revere began his 1775 "midnight ride"), and the 1978 Charles River Dam. This is one of the most complicated and least appreciated open space reclamation projects in Greater Boston.