This is the supersonic wind tunnel located on Tennessee's Arnold Air Force Base. It is used to test "advanced hypersonic technologies such as wave-rider-type vehicles, scramjets and transatmospheric space planes." And it appears terrifying. Just look at the full-sized image.


Click on the image for a closer look.

To echo our pals at Jalopnik: I definitely wouldn't want to stand in that man's shoes when someone flips the "on" switch. [Arnold AFB via Jalopnik]

Photo Credit: U.S. Air Force photo/Lance Cheung