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.