Back in the 1950s, there was a top-secret program code-named SUNTAN being conducted at a top-secret facility called Skunk Works. Its objective? To develop a liquid-hydrogen-powered spy plane. Because liquid hydrogen is incredibly volatile, early experiments were conducted inside a bomb shelter with eight-foot-thick walls.

With stealth technology, the U.S. could spy on its Cold War adversaries without running the risk of getting caught.

Who would have thought that in the 1950s, Burbank was a hotbed of international espionage?

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