Viewing this page in natgeo's website: http://news.nationalgeographic.com/news/2010/06/photogalleries/100601-sinkhole-in-guatemala-2010-pictures-world/ Webkit would not finish loading and display the page, but returns you to the previous page in the history.
<rdar://problem/8064498>
Broken in <http://trac.webkit.org/changeset/48644>.
This no longer reproduces with the original URL.