I've been to the Toronto, Montreal and Cappadocia underground cities. The others sound fascinating. Maybe time for a trip... http://weburbanist.com/2010/06/17/down-towns-6-unbelievable-underground-spaces/ Sent from my kitchen...------------------------------------------------------------------ To change your Lit-Ideas settings (subscribe/unsub, vacation on/off, digest on/off), visit www.andreas.com/faq-lit-ideas.html