<http://schema.org/description>
"Studying lost civilizations is about more than marveling at pyramids or ancient architecture -- it&amp;#039;s an opportunity to learn what kinds of things can bring a once great empire to its knees. How much do you know about some of history&amp;#039;s lost cultures?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://history.howstuffworks.com/historical-events/lost-civilizations-quiz.htm>