The U.S. National Park Service, which is celebrating its 100th anniversary this year, is charged with researching and maintaining many of America's most beloved historic sites. Some of those sites relate to the civil rights struggles of the Lesbian, Gay, Bisexual, Transgender, and Queer (LGBTQ) population. A special heritage theme study of LGBTQ sites and history was published this year. It's extensive, peer-reviewed, and covers many sub-populations:
Whether you're interested just in historic closets, or also in the people who emerged from them, this study might well have valuable information for you.