The National September 11 Memorial & Museum remember and honor the victims of the attacks of September 11, 2001, and February 26, 1993. Several volunteer positions are available, including visitor-center greeters and museum educators.

Many museums and cultural institutions throughout the city offer free general admission, either full time or on select days and hours. Museums including the American Folk Art Museum, the Leslie-Lohman Museum of Gay and Lesbian Art and the National Museum of the American Indian are always free, while the Museum of Modern Art (4pm-8pm Fridays), the 9/11 Memorial and Museum (5pm to close Tuesdays) and the Brooklyn Children’s Museum (2pm-6pm Thursdays) are free during specific times.