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From Underfoot
Underfoot allows you to explore details and connections between bunkers, mines, tunnels and caves. Use it to research sites, connect to fellow enthusiasts or just plan a grand day out. Sites have descriptions, maps, photo albums, timelines, links to heritage resources, powerful filters and targeted searches.
Part of the Expounder family of websites. It does not host much original content, but uses Wikidata as a backbone to display Wikipedia and Wikimedia data and link to other sites in a friendly fashion.
overview
custom searches
timeline
Wikipedia
gallery
table
For example Subterranea Britannica have visited Fan Bay Deep Shelter and the Ramsgate Tunnels in the United Kingdom.
Suggestions for improvement, including new data sources or display methods, welcome, contact John Bray
It has 77,502 pages on 35,908 sites, 291 classes, 12 subpages, 173 areas, 116 organisations and 12 publications.