Maps Explained

"The Royal Observatory, Greenwich Hill, top, and the view of Greenwich and London seen from the hill, below" by Wellcome Collection — https://commons.wikimedia.org/wiki/File:The_Royal_Observatory,_Greenwich_Hill,_top,_and_the_view_of_Wellcome_V0013355.jpg — CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/)

"1940 Census Enumeration" by U.S. Census Bureau — https://commons.wikimedia.org/wiki/File:1940_Census_Enumeration_(5020520332).jpg — Public domain (work of the U.S. federal government, 17 U.S.C. §105: the Commons file page tags it as the work of a United States Census Bureau employee made as part of official duties; also released by the U.S. Census Bureau on Flickr under CC BY 2.0, which is the basis used outside the United States)

"Global Positioning System satellite" by Scott Ehardt — https://commons.wikimedia.org/wiki/File:Global_Positioning_System_satellite.jpg — Public domain (Author dedication, not term expiry: the photographer, Scott Ehardt, released this own work (uploaded 2 June 2005) into the public domain worldwide on the Commons file page, so it holds in the United States and in the EU alike; where a dedication is not legally possible, his fallback grant lets anyone use the work for any purpose without conditions. The photographed object is an unlaunched GPS Block II-A satellite, a utilitarian spacecraft on museum display, not a separate artwork.)