Arizona Roads is a hand-built guide to the state's highways, combining route histories, old maps, numbering changes, freeway information, photographs, and oddities from decades of Arizona road development.
Michigan State University's GEO 333 site turns a regional geography course into a dense web reference covering geology, glacial history, cities, boundaries, land use, settlement, maps, quizzes, and Great Lakes geography.
Paul Freeman's Abandoned & Little-Known Airfields has been documenting vanished airports since 1999 and now contains thousands of entries assembled from maps, aerial photographs, directories, memories, and contributed research.
Don Hitchcock's Don's Maps has grown into a huge independent archaeology reference covering Paleolithic sites, cave art, tools, figurines, human evolution, ancient cultures, maps, translations, and photographs assembled through years of patient personal research.
AJFroggie became a long-running personal highway-history resource covering Interstate planning, route histories, maps, proposals, and transportation details later cited by other road-history references.
Yuuji Hayashi's Tokyo Toilet Map photographed, rated, and mapped public toilets around Tokyo in 1996 and 1997, decades before location-review apps made the idea ordinary.
Eric Stuve's OKRoads preserves highway guides, road-trip photography and hand-built maps from the era when documenting an interchange meant driving there with a camera.
Howard Wiseman's long-running Ruin and Conquest of Britain project maps the fifth and sixth centuries while being unusually explicit about where the evidence turns speculative.