THEORY
Ethics
Observations
 
PRACTICE
Abandoned Sites
Boats
Churches
Drains/Catacombs
Hotels/Hospitals
Transit Tunnels
Utility Tunnels
Various
 
RESOURCES
Exploration Timeline
Infilnews
Infilspeak Dictionary
Usufruct Blog
Worldwide Links
Washington

Adventuring - Wes Modes' great site — primarily focused on train hopping but with something for everyone.
Nite Crawler Nerve Center - Site of a group of explorers in Washington state.

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