My favorite: The Russian Market in Phnom, Penh, Cambodia
The smells are distinct; the sounds are distinct. I could [and have] walked around for hours, observing, just taking everything in. I still remember a young boy I met there last summer, selling books about Cambodia, and cards painted by victims of landmines on the Cambodia/Vietnam border. There is also the sweetest, most precious man in the cafe area that claims to serve Phom Penh's best iced coffee [and he does by the way.] So if you're ever in the Russian Market, find the man with the smile and all the flags!
Here he is: