FREEResources Archives Portal EuropeProvides access to information on archival material from different European countries as well as information on archival institutions throughout the continent. Google Earth (mappe storiche)Explore more than 100 historical maps from around the world dating from 1680–1930 and hand-selected by David Rumsey. Old Maps onlineOld Maps Online is the easy-to-use gateway to historical maps in libraries around the world. World Digital LibraryIs an international digital library operated by UNESCO and the United States Library of Congress.