The conservation movement pushes the government to establish one agency to oversee all the parks, leading to the National Park Service in 1916.

Beatrix Farrand was responsible for some of the most celebrated gardens in the United States and helped create a distinctive American voice in landscape architecture.

Find out how the concept of Spy Creatures evolved from the original Bouldercam to the Penguincams that inspired the next-generation “spycams” featured in this series. It shows the painstaking work that goes into building the lifelike models and how the team deploys and operates the robotic cameras on location all over the world.

Go beneath the surface and meet Africa’s river giants, the hippos. Discover an unexpected side of these aquatic mammals that can’t even swim as hippos protect their families, face their enemies and suffer in a drought. Narrated by David Attenborough.