I just came across this lovely site that was actually uploaded (I believe) in 2004, but began in 2001. The photojournalism site, created by Lorenzo Fonda and Davide Terenzi, shows various locations over a 24hour period. It has an intro that helps set the mood:

“Humans are all equal. They have the same needs. They feel, act and behave accordingly to an unknown law. Urban places know this well. By living the life of urban infrastructure, you become an external observer of what happens everyday in every place on earth.”

Check out: www.theircircularlife.it