see a moonbow

I once went through Corbin, KY on my way to visit my father in Indiana. There is a place there called Cumberland Falls, which is supposededly the only place in the world besides Australia where one can see a “Moonbow” (As opposed to Rainbow). It is only visable at a few specific times of the year, and then only if weather conditions are right. Something that unique must be worth the trip, especially if you are lucky enough to see it with someone you love.