Geography and Environmental Sciences

• Bouncy Maps - Cartograms allowing the user to transform world maps to show how large countries would be if a criteria other than area were the key.
• David Rumsey Historical Maps Collection - over 100,000 maps and related images browseable online, including rare 16th through 21st century maps of the countries, continents, and the world. 
• Map History - Online history of maps and cartography from the former Maps Librarian of the British Library in London.
• Map Projections -  A gallery of black and white pdf printable map projections sorted by type.
• U.S. Color Landform Atlas - Images of US states: shaded relief, false-color satellite view, and maps from an 1895 atlas.
• Earth and Moon Viewer - Switzerland's Fourmilab presents views of the Earth, Moon, and Solar System. 
• United Nations Cartographic Section - A collection of general and mission-specific maps from the UN.
• USGS on Map Projections - Informational pamphlet about map projections from the USGS.
• GeoData - University of Texas searchable/browseable repository of geospatial data and maps.
• Perry-Castañeda Legacy Maps Collection - Browseable collection of online maps from University of Texas repository's legacy site.
• The National Map - USGS "Topographic Information for the Nation" project, including topographic maps and GIS data for elevation, hydrography, watersheds, geographic names, orthoimagery, governmental units/boundaries, transportation, and land cover.

Real-Time Traffic Maps

• Iteris - Real-time traffic maps for various locations in the US.
• Sigalert - Traffic maps in the US by coordinates. 
• Washington State DOT - Traffic maps and cameras by city/region for the state of Washington.
• Sytadin - French traffic maps for Paris and the surrounding area.