Vintage photos from the last time Americans faced the threat of nuclear war

Bomb shelters are in the midst of a revival.

As tensions between the United States and North Korea continue to escalate, bomb shelter manufacturers are reaping the benefits, the Associated Press reported.

"When Trump took office it doubled our sales, and then when he started making crazy statements we got a lot more orders," Walton McCarthy, who works at Norad Shelter Systems LLC in Garland, Texas, told AP.

Today, in a tweet, President Trump called North Korean leader Kim Jong Un "obviously a madman" and said he "will be tested like never before."

Below, take a look at how Americans dealt with the threats of the Cold War during the 1950s and '60s - the last time nuclear war felt dangerously close.