There is a group effort commencing beneath the English city of Nottingham with a main goal of assessing the archaeological importance of nearly 500 man-made caves that were cut into the sandstone during medieval times and possibly earlier. The caves have served many purposes from housing dungeons, beer and wine cellars, malt-kilns, tanneries, and even a bowling alley, to serving as air-raid shelters, sand mines, and summer homes. Some caves currently serve as visitor attractions or are used for commercial purposes but most caves lack public access and remain unknown.

 …