Lancaster University is the home of the Molefone - one of the first widely used cave radios. This would be a good place to learn about caving or the UK potholing scene. One of the most extensive caving Web sites is that of Sherry Mayo in Australia. Links are provided to many other caving site on the Web. Also in this category are mines, bunkers, ice houses, sewers, and radar stations to mention but a few.
Archaeology is a major emphasis.