<http://schema.org/caption>
"Taken on August 28, 1884, this is the oldest known footage of a tornado. It was taken in South Dakota, 22 miles southwest of Howard."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.4029tv.com/article/majestic-monsters-tornadoes-captured-over-the-years/4913336>