For no other reason than it is beautiful, here is a picture astronaut André Kuipers took of Buenos Aires as the International Space Station sailed into the night over the Atlantic Ocean.
[Click to enmásgrandenate.]
Kuipers took that picture on May 11, 2012. Looking to the west you can see the city lights, as well as the thin green line of the atmospheric aerosol layer. I suspect that's Venus right over the horizon, too. The silhouette is of the Russian Progress 47 capsule which docked with the ISS in April, and will remain there for several more months.
Image credit: NASA/ESA