Did you see it with the naked eye or had to use a binocular/telescope?
From [ame="http://en.wikipedia.org/wiki/International_Space_Station"]International Space Station - Wikipedia, the free encyclopedia@@AMEPARAM@@/wiki/File:ISS_Logo.svg" class="image" title="The International Space Station on 23 May 2010 as seen from the departing Space Shuttle Atlantis during STS-132."><img alt="The flags of the United States, United Kingdom, France, Denmark, Spain, Italy, The Netherlands, Sweden, Canada, Germany, Switzerland, Belgium, Brazil, Japan, Norway, and Russia." src="http://upload.wikimedia.org/wikipedia/commons/thumb/3/3a/ISS_Logo.svg/300px-ISS_Logo.svg.png"@@AMEPARAM@@commons/thumb/3/3a/ISS_Logo.svg/300px-ISS_Logo.svg.png[/ame]:
The space station can be seen from Earth with the naked eye, orbiting at an altitude of approximately 350 kilometres (220 mi) above the surface of the Earth,[13][14][15] travelling at an average speed of 27,724 kilometres (17,227 mi) per hour, completing 15.7 orbits per day.[13]