Minuteman Missile National Historic Site Wall SD – September 2021 This is an incredible site. This visitor center is a museum and they show a 20 minute film that explains the nuclear program that used underground silos in South Dakota and throughout the Great Plains during the Cold War through the 1990s. The site actually consists of three different sites. This visitor center, the underground bunker, and the missile silo itself. We were unable to get tickets for the underground bunker, darn it! This is the missile silo for a Minuteman Missile. This is a disarmed Minuteman Missile in its actual underground silo.