An 1850 print depicting the death of Zachary Taylor —
Photo Credit: By Cornell University Library - Death of Genl. Z. Taylor, 12th President of the United States, No restrictions, https://commons.wikimedia.org/w/index.php?curid=51437374

Zachary Taylor —
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=71911954

Emerson's grave — Sleepy Hollow Cemetery, Concord
Photo Credit: By Allowishus - my sony DSC-P200 camera, Public Domain, https://commons.wikimedia.org/w/index.php?curid=4971751

Ralph Waldo Emerson — American writer Ralph Waldo Emerson in 1857
Photo Credit: Public Domain, https://commons.wikimedia.org/w/index.php?curid=11868430

Harvard's Hollis Hall in 1934 — Thoreau's dorm, it was built in 1763 by Thomas Dawes, and housed George Washington's troops during the American Revolution
Photo Credit: By Arthur C. Haskell, photographer. - Public Domain, https://commons.wikimedia.org/w/index.php?curid=9599966

Harvard Yard — Freshman dormitories
Photo Credit: By The original uploader was Mancala at English Wikipedia. - Transferred from en.wikipedia to Commons by Vinhtantran. Created by user:Mancala., Public Domain, https://commons.wikimedia.org/w/index.php?curid=5922104

Walden — Cover art from first edition of Henry David Thoreau's Walden (1854)
Photo Credit: By Unknown -Public Domain, https://commons.wikimedia.org/w/index.php?curid=2226804

Edward Stratemeyer —
Photo Credit: By Unknown - http://www.keeline.com/Stratemeyer/WC_TOC.htm, Public Domain, https://commons.wikimedia.org/w/index.php?curid=10939714

Cover of The Tower Treasure —
Photo Credit: By Source, Fair use, https://en.wikipedia.org/w/index.php?curid=22318243

Devil's Rock — Overlooking Lake Temiskaming, near Haileybury, likely inspired descriptions in The House on the Cliff
Photo Credit: By Jean-Paul Lefaivre, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=46645484

Main Street, Haileybury, 1915. — Town where McFarland grew up, it serves as a model for the Hardy Boys' Bayport
Photo Credit: By Unknown - http://www.museevirtuel-virtualmuseum.ca/sgc-cms/histoires_de_chez_nous-community_memories/pm_v2.php?id=record_detail&fl=0&lg=English&ex=00000444&rd=113500#, Public Domain, https://commons.wikimedia.org/w/index.php?curid=33075135