Already a WTTW member? You may have an unactivated WTTW Passport member benefit. Check to see.
03/19/2017 | 5m 45s
It’s a seemingly impossible task: cataloguing every wild plant species in Central Park. But that’s exactly what two botanists are doing, and they’re making some surprising discoveries along the way.
Aired: 03/19/17
Video has closed captioning.
Central Park Plant Census
Cities once converted streams into sewers to make room for development.
Saving San Francisco’s Sea Lions
The Marine Mammal Center in the San Francisco Bay Area is on a mission to save sea lions.
Nature is taking over at North Brother Island, the former home of a typhoid hospital.
The salt marshes in New York's Jamaica Bay support endangered birds and rare turtles.
Hiking Through History in The Presidio
What was San Francisco like before Europeans arrived? Look no further than The Presidio.
Want to know what Chicago looked like 200 years ago? Head to the city’s southeast corner.
