- Ohio Exploration Society - exploring the forgotten and historical sites of Ohio, one place at a time.
- Among the Ruins - photographic survey of fire devastated Chicago, conducted by Jex Bardwell and George N. Barnard.
- Lost Destinations -
- Action Squad : Twin Cities Urban Adventurers - regularly updated online home of an exploration crew active since 1996. Site features trip logs, maps, historical info, and hundreds of photos.
- Urban Explorers Network - examining the secret tunnels under most of the country's colleges and other institutional campuses.
- Undercity.org -
- Lost Indiana -
- Entrances to Hell - photos of strange doors and openings around the U.K., and nobody is quite sure to where they lead.
- Souterrains - man-made underground objects, artificial cavities, mines, quarries, and tunnels.
- Sleepy City -
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Explore the Worldviewer.com Network Sites
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