Headquartered in Hartford, Connecticut, the organization was founded in 1936 as the Antiquarian & Landmarks Society.

Some of these sites include: In February 2018, a series of articles was published by The Day detailing the alleged neglect of historic properties under their care,[2] not following bequest terms,[3] and misuse of funds.

In January 2019, the Connecticut Office of the Attorney General issued a report[5] that "Connecticut Landmarks did not misapproriate any charitable funds in its stewardship of Forge Farm in Stonington and a historic home in East Haddam.

Connecticut Landmarks was forthcoming with information, and we have appreciated their cooperation throughout our review.

We found no evidence of misappropriation of charitable funds, but have identified areas where we would like to see Connecticut Landmarks better address donor intent and the management and preservation of both its real and personal property.”