For those in Minneapolis: go outside tomorrow evening at 9:50 and look west. Atlantis undocked from the International Space Station today and will be holding position about 70 km away until cleared to deorbit on Thursday (at the soonest). The pair should be a noteworthy sight.
For those elsewhere, you can always go here to find out when things will be passing over your location.
On June 13 the ISS, with Atlantis docked, passed (roughly) over Minneapolis. It is a rather difficult target to photograph!