Nice link. I'm sure it'll come in handy for almost everyone here.

Good site, I think it's been posted before though, still an interesting read.

Oh that could be useful, I've been looking for something like that, cheers.

Very good find. I'm sure I will be visiting most of the sites listed on the page. The "Exploring the Chicago Tunnel Company in the 1980s" page was very interesting and well worth a look for anyone interested in old, abandondoned civilian tunnels.