- Subterranea Britannica
Devoted to the study and investigation of man-made and man-used underground places.
www.subbrit.org.uk
- Entrances to Hell
Photos of strange doors and openings around the U.K., and nobody is quite sure to where they lead.
www.entrances2hell.co.uk
- Undergroundkent
Ex-military tunnels, Napolenic fortifications, and underground structures in Kent, England.
www.undergroundkent.co.uk
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