Hard to believe it's been a quarter-century since the leaders of the United States and the Soviet Union sat down and agreed to reductions in nuclear weapons. For a look back at the Strategic Arms Reduction Treaty, stop by the Minuteman Missile National Historic Site in South Dakota.

At the height of the Cold War the nuclear missiles in South Dakota and five other states presented a paradox; while Soviet satellites had pinpointed their locations, American citizens were scarcely aware of the arsenal in their midst. Thirty years ago, concerned peace groups undertook the task of mapping the missile fields with the intention of sparking debate about the weapons stored there.