#MuseumSelfie Day, now in its fourth year, is a nationwide initiative encouraging museum visitors, staff, and volunteers to snap a selfie at their favorite institutions and share it on Instagram and Twitter with the hashtag #MuseumSelfie on January 18, 2017.

Begun as a way to highlight museum collections and inspire more people to visit them, #MuseumSelfie Day was launched by museum professional Mar Dixon in 2014.

Are you one of the more than 4,000 researchers from across the country and around the world that visit HSP’s historic library each year? Snap a photo and tag #HistoricalPA to be featured on HSP's social media and in the History Happenings newsletter.

Here are a few seflies snapped by HSP staffers:

HSP's Education Manager Alicia & Researcher Extraordinaire Ron kicked off our #MuseumSelfieDay2017.

JC, HSP's grants czar and master of language's economical use, captioned his #MuseumSelfie thus: "Me & A Map." We couldn't agree more.

HSP’s Christina, editor of the Pennsylvania Magazine of History and Biography (PMHB), poses for #MuseumSelfie Day with the newly-arrived January 2017 issue of PMHB.

While en route to the third floor on perhaps PA's slowest elevator (mercifully bedecked with a reproduction of Philadelphia's famed Water Works), HSP's Beth took a moment to celebrate this year's #MuseumSelfie Day.

HSP's collection is rich in documenting the development of American photography, including the oldest extant photograph taken in the U.S., and works by Philadelphian Robert Cornelius, the individual credited with snapping the first self-portrait, or "selfie."