What a treasure trove of images to be found at this site! NYPL Digital Gallery provides free and open access to over 800,000 images digitized from the The New York Public Library's vast collections. You can browse by topic or search by item or name. This site has served my undergraduate, credential, and graduate students well in assignments where they needed to know what something looked like or needed and image (following fair use guidelines) for curriculum development.
Some of the images in the Digital Gallery may be subject to third party rights such as copyright and/or rights of privacy/publicity. Before using any of these images please review the Library's terms and conditions found at the bottom of the site homepage.