Alex J. Wood was in the Yosemite Valley on Monday morning taking photos of El Capitan's picturesque rock face when he heard what sounded like the "loudest thunder ever."
He immediately looked up and saw a huge rock falling down the famous granite slab.
"I couldn't believe what I saw," Wood said, who happened to be taking photos at the time and captured the final portion of the rock's fall on video. "It looked like a giant oversized grand piano falling in slow motion. … It was mad.
