Located just off of Exit 116 along Interstate 90 near Wall, South Dakota and surrounded by short grass prairie sits the Delta-09 missile silo, where "from 1963 until the early 1990s, the missile silo at Delta-09 contained a fully operational Minuteman Missile, bearing a 1.2 megaton nuclear warhead. The Delta-09 missile silo was one of 150 spread across western South Dakota. In total there were 1,000 Minuteman missiles deployed from the 1960's into the early 1990's. Visitors can now tour the site daily."