Near the cloud forests in the mountains of Costa Rica, rainbows frequently last for over an hour. In the Midwest, where I grew up, rainbow are so rare and fleeting it never occurred to me that since rainbows are at a fixed angle relative to the sun, as the sun rises, a rainbow will set. In the afternoon, as the sun sinks, the rainbow rises.
A rainbow makes the plainest of scenery quite dramatic. This is a rainbow I saw from a train in Kansas.