5 centuries of bubbles and bursts
History is replete with financial frenzies that seem ridiculous in hindsight, but were viewed as anything but at the time.
At the dawn of the Space Age, stocks with "tron" in their name - like Astron and Transitron - zoomed to the moon. But in 1962, they came crashing back down to earth.
NEXT: 1974-80: Gold Rush II