Where Our Information Comes From

This directory started with public, verifiable data.

• Indie BookstoresThe NewPages independent bookstore directory (1,006 general-interest stores, specialty retailers excluded).
• General Museums, and the museum-derived portion of several other categoriesThe IMLS Museum Data File, a free federal dataset covering more than 30,000 U.S. institutions.
• Museum accreditation and quality filteringThe American Alliance of Museums Continuum of Excellence, across four graded tiers: full Accreditation, Core Documents Verification, Museum Assessment Program participation, and Pledge of Excellence.
• Museums for AllAn IMLS-supported initiative administered by the Association of Children’s Museums; participation requires charging admission and staffing a ticket desk.
• Smithsonian AffiliationsThe Smithsonian Institution’s directory of vetted affiliate organizations.
• Botanical Gardens & ArboretumsThe American Public Gardens Association garden directory, and the Association of Nature Center Administrators member map.
• Children’s MuseumsThe Association of Children’s Museums member directory.
• Science and technology institutionsThe Association of Science and Technology Centers Passport Program participant list.
• Zoos, Aquariums & Marine LifeThe Association of Zoos and Aquariums accreditation list.
• Observatories & PlanetariumsThe Worldwide Planetariums Database dome census, used to independently validate observatory records, together with NASA’s Night Sky Network facility directory.
• Dark Sky PlacesDarkSky International’s official list of certified International Dark Sky Places.
• Old Growth ForestsThe Old-Growth Forest Network, which lists only forests it has confirmed are open to the public.
• National Champion TreesThe National Champion Tree Program register, administered by the University of Tennessee Institute of Agriculture.
• Show Caves & CavernsThe National Caves Association, whose membership criterion is that a cave be open to the public for tours.
• Historic CarouselsThe National Carousel Association census of operating North American carousels.
• Historic MillsThe Society for the Preservation of Old Mills (SPOOM) North American Mills survey, filtered to its “Open to Public” designation.
• Wildlife WatchingThe Hawk Migration Association of North America (HawkCount) site directory, the Xerces Society’s firefly tourism sites, and Bat Conservation International’s bat viewing destinations.
• Marine LifeFlorida Fish and Wildlife Conservation Commission permitted sea turtle walk operators and official manatee viewing sites.
• Historic LibrariesThe IMLS National Medal for Museum and Library Service, the AIA/ALA Library Building Award, the Membership Libraries Group, and editorial guides from Fodor’s, Smithsonian Magazine, Reader’s Digest, Bookstr and The Critiquing Chemist.
• Historic Sites & LandmarksAccredited historical societies and historic preservation organizations drawn from the IMLS Museum Data File and the American Alliance of Museums accreditation list.
• Geographic dataU.S. Census Bureau ZIP Code Tabulation Area Gazetteer files, and the U.S. Census Geocoder.
• Ghost TownsNo single federal or association directory exists for this category. Editorially curated against Atlas Obscura and US News national roundups, and BLM and state historic-site registries.
• Zipline AdventuresNo association directory exists for this category. Editorially curated against operator listings and outdoor-recreation roundups.
• Hot Air Balloon RidesThe Balloon Federation of America’s member directory, and national balloon-festival coverage.
• Underground Mine ToursNo association directory exists for this category. Editorially curated against publicly documented, currently operating mine-tour attractions.
• Shipwreck Dive TrailsState and NOAA underwater preserve and shipwreck-trail programs, curated at the trail/preserve level rather than by individual wreck.
• Fire Lookout TowersThe U.S. Forest Service and recreation.gov lookout-rental program.
• Walk-Behind WaterfallsState park and national forest waterfall trail guides.
• Meteorite Impact CratersThe Barringer Crater Company and published planetary-science crater surveys. A short list by nature (8 entries) - that is the genuine national count of publicly accessible, verifiable impact sites, not a partial pull.
• Butterfly GrovesThe Xerces Society and state park monarch overwintering site lists.
• Bioluminescent KayakingPuerto Rico and U.S. Virgin Islands tourism authority bioluminescent bay operators. A short list by nature (9 entries) - that is the genuine national count of publicly accessible, verifiable sites, not a partial pull.
• Native American Heritage SitesThe American Indigenous Tourism Association’s Destination Native America directory and American Indians and Route 66 guidebook (with the National Park Service). A first pass, editorially curated to 20 of the corridor’s most significant cultural centers, museums and historic sites for the Route 66 centennial; not yet expanded beyond the Route 66 corridor.