Damn, fuck this minus billion degree (with wind chill factored in) weather. I could go for some fake indoor weather. They say weather is the one thing you can't change about where you live. I say there must be a way. (Hence, the underground cities in Toronto and Montreal.)

Btw, did y'all see that Biosphere/2 was on the auction block? Nice weather + some research oppurtunities?

Philly has a lot of untapped potential underground. There are miles of underground concourses connecting train stations and various buildings downtown. Some of the concourses even have storefronts that have never been put to use. I've been meaning to do a bit of exploring. I'll take some photos and put them up when I do.

That's cool. The underground cities of Montreal and Toronto are massive though, on the order of 20 miles... made possible due to their relatively modern subway systems. Speaking of underground potential and subways, Cincinnati has both rolled up into one.

I forgot to say a word about this topic as it relates to Tokyo as well.. besides their large indoor recreational parks. Many subway stations in Japan are also fairly large department stores / malls with stores lined along fairly long walkways.

Wow, I never knew a subway was built in Cinci. There is some good info and photos here.