The cause is unknown but flames spread quickly because construction workers had just applied an inflammable preservative to the wooden walls.
Johnny Cash' home today: A pile of rubble and steel
Cash and his wife, June Carter Cash, lived at the lakeside home in Hendersonville, Tennessee, from the Sixties until their deaths in 2003.
It featured in the film Walk The Line about Cash's life. Barry Gibb bought the house last year and was having it restored. He was said to be "devastated".
Cash's hits included Ring Of Fire and I Walk the Line. He wrote Folsom Prison Blues and songs for the live album recorded at San Quentin at the house.
More follows...
Johnny Cash outside his home in 1968
Among the guests during his career were preacher Billy Graham, Bob Dylan and Kris Kristofferson.
"So many prominent things in American history took place in that house," said country singer Marty Stuart.
Johnny Cash in later life
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