Looks like the engine test facility was a major one. Again, it's a step, but just as important is how all the verifications take place.
N.Korea to Destroy Tongchang-ri Missile Test Site - The Chosun Ilbo (English Edition): Daily News from Korea - North Korea
Quote:
{quote is from a different article by Business Insider}North Korea will destroy a large-scale facility in Tongchang-ri, North Pyongan Province that was used to test engines for the intercontinental-range ballistic missile, the Hwasong-14, according to South Korea's Chosun Ilbo.
The Hwasong-14 was the first North Korean missile experts said could hit the US mainland with a nuclear payload.
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