The Greenbriar "Continuity of Government" bunker was top secret. It was even constructed during an expansion of the hotel to disguise its existence. After the Cold War (better name might be "World War-III" or the "45 year war" or the "Great Ideological War" or the "War between the East and the West" - pick your name), it became for awhile a relic like a battleship after WWII. We didn't think we needed it anymore. I think that might be why Washington Post decided to reveal it. WaPo likes to spy on its own government.
The hotel is beautiful and it has all the amenities of a mountain resort including clays. There are others, built on warm springs in the 1920's-30's the Homestead being one of them.