Top technology headquarters around America: Google, Apple Computer & Microsoft. Thanks: Eric, Mathew, Ahmad

It hasn't erupted since 1980 March 2005, but apparently Mount St Helens still counts as an active volcano. Not great resolution here yet though. Thanks: Sean Miller, kb and others.

Another impressive shadow - the Seattle Space Needle. The red and purple blob next door is the Experience Music Project. Thanks: Phillip Harrington, Mike, many others.

The CN Tower and Rogers Centre (formerly the Skydome, home of the Blue Jays) are in downtown Toronto, Canada. Look for the tower's shadow to see its shape. Thanks: Mike Pegg, many others

The first stadium is the San Francisco 49er's Stadium Monster Park (formerly 3com park) (thumbnail #1 below) and it seems they were playing at the moment the photo was taken. There's lots of stadiums in this shot of Philadelphia In…

A very popular submission has been the The Gateway Arch or rather it's massive shadow, 'raydancer' notes that is it the tallest national monument is the United States at 630 feet and is just as wide. If you look West…