After returning from each flight around the globe I place a pin in the locations I visited. The color of the pin represented various events, but the red ones in particular carried significant meaning.
Each red pin in my map represents a time when I thought death was imminent.
Red - Near death experience
Black - Aircraft ground problems
Blue - Visited more than 5 times
Green - Visited more than 10 times
Yellow - Not sure
White - Visited as Civilian