Frederick Law Olmsted, renowned for his designs with Calvert Vaux for Central Park and Prospect Park in New York, envisioned landscape as an art, a science, and a social ideal. In designing the U.S. Capitol grounds, he met a new challenge to create a landscape that was both part of the Capitol but also subsidiary to it. His son Frederick Law Olmsted Jr., as a member of the 1901-2 McMillan Commission that updated the plan for Washington, designed the formal landscape of the National Mall as well as a city-wide park system. What was the Olmsted landscape ideal and how did the father and son create unique landscape designs for their designs for the capital?