James Madison's Montpelier at Montpelier
Station, Virginia
https://www.montpelier.org/

James Madison Museum in Orange, Virginia
www.jamesmadisonmus.org

The James Madison Center at James Madison University in Harrisonburg, Virginia
https://www.jmu.edu/civic/madison.shtml

The James Madison Papers at the United States Library of Congress
https://www.loc.gov/collections/james-madison-papers/

The James Madison Treasures at the United States Library of Congress
http://www.loc.gov/exhibits/madison/objects.html

Wikipedia article on James Madison
https://en.wikipedia.org/wiki/James_Madison

The Papers of James Madison at the University of Virginia
https://pjm.as.virginia.edu/

Constitution Day at James Madison's Montpelier
http://www.virginia.org/site/description.asp?attrID=20590

Madison Family Genealogy Forum
https://www.genealogy.com/forum/surnames/topics/madison/

Belle Grove Plantation
http://www.bellegrove.org/

A list of homes or studios of women who influenced our history, or were preserved thanks to the generosity and vision of preservationist-minded women
http://member.nationaltrust.org/site/PageServer?pagename=women_in_history_sites_2006