Joshua Foer is a guest blogger on Boing Boing. Joshua is a freelance science journalist and the co-founder of the Atlas Obscura: A Compendium of the World's Wonders, Curiosities, and Esoterica, with Dylan Thuras.
I ought to leave the Minnesota curiosities to Dylan, since that's his home turf, but I was just poking around the Atlas and stumbled on a mysterious waterfall called the "Devil's Kettle," recently added by a user named nursecarman. I realized I'd never seen anything quite like it before.
There is a mysterious waterfall in Judge Magney State Park in Minnesota. Half of the water drops 50 feet into the Brule river; the other half falls into a cauldron and disappears! Dyes and ping pong balls have been dropped into the pothole in an attempt to trace its route and find its outlet--presumably the water winds its way underground to Lake Superior a mile away--but the other end of the Devil's Kettle has yet to be found.
Anyone know of any other disappearing waterfalls like this? I'm guessing there must be others.