Air-tight Security

This is the city jail in Interior, South Dakota Population 77 (last census, probably a bit less now), located about a mile outside of the Badlands National Park. Not much else to the town - one open grocery store, a gas station, a few blocks of not-too-pretty houses, and a one block "downtown" area with a school. There are a couple of tourist camps nearby, but that's about it. Frankly, the place was more than a little depressing. And, apparently, if you screw up there, this is where you end up. The escape-proof, modern, correctional facility.