00:00 (dramatic music)
00:03 More than 2 million acres, part wildlife sanctuary,
00:07 part geological wonder.
00:09 Yellowstone National Park is an American treasure.
00:15 (water rushing)
00:20 (dramatic music)
00:23 (water dripping)
00:28 (dramatic music)
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00:35 More than 3 million visitors come to the park every year
00:38 to witness its wealth of natural wonders.
00:40 Where thousands of buffalo roam freely
00:50 in a land of thundering waterfalls, gurgling mud pots,
00:56 and geysers spewing hot steam and water
00:59 hundreds of feet into the air.
01:01 When tourists visit Yellowstone,
01:05 they may not know that they are standing
01:07 on top of an active volcano,
01:09 but scientists know it.
01:11 And for them, Yellowstone is one giant natural laboratory.
01:16 They dig through giant walls of limestone,
01:21 looking for remnants from prehistoric times,
01:24 and deep into Yellowstone Lake,
01:26 where in some places, the water is so hot
01:29 that people joke that you can catch a fish
01:32 and cook it at the same time.
01:33 (water rushing)
01:37 This is Yellowstone,
01:44 America's first and largest national park.
01:47 Larger than the states of Delaware and Rhode Island combined
01:54 home to 50 species of mammals and 300 species of birds.
01:58 Where more than half of the world's geysers exist,
02:09 as well as the longest free-flowing river
02:12 in the United States.
02:13 One of the planet's greatest natural science labs
02:18 and most vibrant ecosystems.
02:22 On land, it can sometimes look like something
02:24 from outer space,
02:26 but instead spreads through three US states
02:28 and sits atop a very lively volcano.
02:31 (water rushing)
02:34 (upbeat music)
02:37 (upbeat music)
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