Mt. Vernon National Park is a national park located in Virginia.
On the Show Edit
In "The Diamond Castle", the park is shown to house the titular building, as well as the Fountain of Eternal Presidency. However, located in the castle is a chamber which must be filled with an egg-shaped artifact or else the castle will collapse.
Frank, Baby Cakes and Ronald Reagan reach the Diamond Castle, but lacking the egg, Baby Cakes' head must suffice as Reagan demands. While Reagan spots the coveted fountain, Baby Cakes tires of filling the chamber, leaving Frank to choose between the castle and Baby Cakes. Despite Reagan's threats, Frank saves Baby Cakes, alongside whom Frank exits the castle during its collapse. Still in the castle during its collapse, Reagan bathes in the fountain and after exiting the rubble alive announces he is President for life.