Use the timeline below to select up to 20 seconds to watch or share.
2.17sNo, sir, I am not.
5.47s
1.32s
1.34s
3.04sBart? Lisa?
2.07s
1.92sHello?
1.95s
4.17sThe story of our national parks begins in 1872.
3.22sPerhaps we should let john Muir tell the tale.
3.95s
5.41s
2.75s
2.75sExcuse me, sir? I can't find my children.
0.67sHave you checked the woods?
1.9sNo.
2.97sHmm. Follow me.