We've all seen Old Faithful, Grand Prismatic Spring and Mammoth Hot Springs at Yellowstone National Park, but while all those crazy natural features are cool, there's nothing quite like Fly Geyser (well, nothing on this planet, anyways). A lot of that likely has to do with the fact that it's the result of a freak accident, combined with just the right conditions. Back in 1964, the land was being drilled in search of geothermal energy sources. However, once the drilling was over, the well wasn't capped correctly (or capped at all, for that matter). It wasn't long before dissolved minerals began to bubble their way to the top of the well, accumulating all over and around it, creating the strange formations we see today. They're still growing-- each year, several inches are added to the surreal-looking pillars.
Around the geyser are several terraces and pools which collect the water that's constantly spraying out the top-- the gusts of water can reach more than 5 feet in the air. The bright colors on the geyser are due to thermophilic algae, and it's made of several different kinds of minerals. The geyser and its terraces cover more than 70 acres of land. Fly Geyser isn't the only like fountain in the area-- several others were formed from other drilling projetcs done in the area, including one from the early 1900's that dried up when Fly Geyser started spouting.
Since the phenomenon is on private property, you'll need to make a few calls to get a tour of the place but we hear that it might be possible. The Black Rock Desert Tours no longer have access to the property, but if you head to the nearby Bruno's Country Club, they might be able to put you in contact with the owners. Otherwise, you can keep it simple and spy the oddity from the road-- bring binoculars for an even better view!