Newark, California, United States by britta Cargill salt pools When flying into SFO during the day, you can spot the strangely colorful red-and-white (or pink-and-white) pools of the Cargill salt works in San Francisco Bay, built into the wetlands; the colors come from microorganisms that hint at the salinity levels. This is a good example of aerial views exposing information that is hard to see from ground level. Taking an Amtrak train south from Oakland also gives you an interesting view of the salt-making operations, but it's hard to see their scale from there. Cargill would like to turn this facility into housing, but people aren't too happy about that. For a closer view of the natural parts of the wetlands, this person has many sets of lovely kite photography of ponds (and Drawbridge).