Amherst College
This is the Department of Geology's web site for their Geology 12: Principles of Environmental Science course. It contains some valuable historic maps of Boston Harbor.

Boston Harbor Watershed Map
This excellent color watershed map includes Neponset, Mystic and Charles watersheds.

Boston Light photos:
Part of a lighthouse site out of the University of Tennessee; four good photos of Boston Light with descriptions of this historic landmark.

Fort Warren
This photo is part of a site which includes information compiled by Edward Rowe Snow on Fort Warren during the Civil War.

Library of Congress, American Memory Project
This site features useful historical maps of Boston Harbor as part of the Library of Congress's American Memory Project.

Map of the Boston Harbor Islands
This map identifies the islands by name.

MIT/Ortho:
This site, a collaboration between MIT and MassGIS, presents aerial orthophotos of the Boston area. Point to the Boston Harbor area you wish to view and click.

NOAA Photo Library Collection:
See Coastline Collection for historic images of MA coastline, including Boston Harbor views of East Boston, South Boston and Charlestown. See restrictions re credits.