Skip to main content

Up Next

Episode 5: The Calling

The Calling

Season 4 Episode 5
53:05
When Whales Could Walk

When Whales Could Walk

Season 51 Episode 1
53:31
Back to Show
Overview

What Happened to America’s First Megacity?

Season 2 Episode 6

In its prime, Cahokia was a prosperous city with a population similar to London’s. But this sprawling Native American metropolis from the Mississippian culture vanished long before Europeans arrived in North America. What happened? Now, cutting-edge scientific research offers a glimmer of hope in unraveling the mystery of Cahokia's disappearance.

Support Provided By
Season
Scientists Solve the Mystery of a 300-Year-Old Megaquake
13:32
Scientists find the exact time of a massive quake using trees, soil and human records.
What happened to the once lush, now desert-like Colorado River Delta?
16:32
What happened to the once lush, now desert-like Colorado River Delta?
Why This Unusual Pattern May Save the Rainforests
9:31
How is this groundbreaking experiment in Ecuador helping deforested rainforests recover?
How Otters Are Saving Earth’s Underwater Forests
10:06
Sea otters play a vital role in maintaining the balance of sensitive kelp forests.
Earth’s History Is Hidden in These Strange Maps
10:14
Exploring LIDAR: Tech using lasers to reveal the deep history beneath our world’s surface.
The Biggest Reason To Feel Hopeful About Climate Change
13:02
Joe visits the world’s largest crane, an engineering feat helping to fight climate change.
Overview Season 1
9:46
These secret islands of the Everglades might be the key to saving it.
Want to Solve Wildfires and Drought? Leave it to BEAVERS!
9:46
Could beavers be the ally we’ve been waiting for when it comes to saving the environment?!
Why the Fastest Place on Earth is Disappearing
7:23
The Bonneville Salt Flats took millions of years to form. We altered it in a century.
What are Wild Coyotes Doing in the Big City?
9:07
In Chicago a new resident has upended our thinking about cities and the natural world.
What Makes These Dunes Sing?
11:15
Why do dunes sing? Head into the mysterious world of sand with host Joe Hanson!
Why Earth’s Newest Glacier is Inside an Active Volcano
8:35
Mt. St. Helens Volcano is the site of the world’s newest glacier, one of the few growing.
Active loading indicator