This Thursday, March 24, Cal Academy's NightLife welcomes award-winning nature photographer and author Ian Shive who will present an evening of photography and short films exploring America’s greatest heritage, the national parks, as well as some of the world’s wildest places from North America to Micronesia.

Enter our trivia contest for a chance to win a pair of tickets to this event as well as a copy of Shive’s newly expanded book, The National Parks: An American Landscape.

To enter, answer this question: the discovery of what area spurred the events that led to legislative protection and preservation of parks for future generations?

Then send your answer to facebook@kqed.org. Winners will be randomly selected from all entries. Deadline for entries is 5pm, Tuesday, March 22, 2010, and winners will be notified by Wednesday at 12pm. Good luck!