Online viewer and download center for nautical charts from the National Oceanographic and Atmospheric Administration (NOAA).
The NYPL's tool for "digitally aligning ("rectifying") historical maps from the NYPL's collections to match today's precise maps," accompanied by many previously aligned maps of New York City.
Digital images of the collections of the National Gallery of Art. You can search, browse, share, and download images of works in the public domain. More than 50,000 downloadable open access digital images are available free of charge for both commercial and non-commercial uses.
The Boston Public Library's online map collection. Includes maps from the American Revolutionary War, the European age of discoveries, and Colonial New England and Boston.
Provides access to over 800,000 images digitized from the The New York Public Library's vast collections, including illuminated manuscripts, historical maps, vintage posters, rare prints, photographs, and more.
Searchable database of images from billboards and other forms of outdoor advertising from 1995 to the present. From the Outdoor Advertising Association of America.
Gateway to historical maps digitized by major map libraries in Europe and the U.S.
A free, open source, editable map of the world. Users can choose various layers, add notes, and share or export the maps they create.
Authoritative reference works on art, including Grove Art Online and Benezit Dictionary of Artists. Contains images of major works important to the study of art history as well as artists' signatures and monograms.
PASDA is a portal for geospatial data from a variety of state government agencies. Use the Pennsylvania Atlas for a map interface for previewing and downloading GIS datasets. Use Imagery Navigator for access to aerial photography from 1996-present.