Following World War II, the parks were overwhelmed as visitation reached 62 million people a year. This final episode describes how a billion-dollar campaign, Mission 66, was created to build facilities and infrastructure to accommodate the growing flood of visitors. Biologist Adolph Murie introduced the revolutionary notion that predatory animals deserved the same protection as other wildlife. In Florida, Lancelot Jones, grandson of a slave, sold his family’s property on a string of unspoiled islands in Biscayne Bay to the federal government to be protected as a national monument. During the late 1970s, President Jimmy Carter set aside 56 million acres in Alaska for preservation- the largest expansion of protected land in history.