S1, E1: In 1864, Congress passes an act that protects California's Yosemite Valley; in 1872, Congress passes an act to protect a part of Wyoming, which becomes America's first national park -- Yellowstone.

S1, E1: In 1864, Congress passes an act that protects California's Yosemite Valley; in 1872, Congress passes an act to protect a part of Wyoming, which becomes America's first national park -- Yellowstone.