Geoff from BLDGBLOG sez,
I thought I'd send a link to a new and very long post I just put up, describing a visit last month to Nottingham, England, where we explored nearly a dozen artificial cave systems, carved directly from the sandstone, with archaeologist David Strange-Walker.
Nottingham, as few people seem to know, is a bit like a sandstone Cappadocia, in the sense that there are at least 450 caves--and quite possibly more than a thousand--that have been cut into the earth, serving as everything from malting kilns to private basements, from jails to "gentlemen's lounges" for underground sessions of cigar-smoking.
We spent literally all day down there, moving from one cave system to another, from pubs to graveyards, and we saw barely a fraction of what's actually under the city.
The post includes some animations, tons of photos, and some laser scans produced by David's organization, the Nottingham Caves Survey. At the very least, their work is well worth checking out, as many of the scans (and the resulting videos) are incredible.