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This view featuring Honolulu, Hawaii was photographed by an Expedition 7 crewmember onboard the International Space Station (ISS). The city is striking for the way it is bound by surrounding geography. Built-up fingers of the city extend northeast onto the steep volcanic slopes and surround the volcanic craters of Punchbowl crater and Diamond Head, leaving undeveloped only parklands and the steepest ridges. They are both tuff cones that formed as magma from the erupting volcano came in contact with ground water at a time when sea levels were higher than they are now. As the water turned to steam, according to NASA scientists, it caused an explosion that formed a hill of ash with a broad crater in the center.