Mt. Vernon National Park is a national park located in Virginia.
On the ShowEdit
In "The Diamond Castle", it's shown to house the titular building. However, located in the castle is a chamber which must be filled with an egg-shaped artifact or else it will collapse. Also present is the Fountain of Eternal Presidency.
Frank, Baby Cakes and Ronald Reagan reach the Diamond Castle, but lacking the egg, Baby Cakes' head must suffice as demanded by Reagan. While Reagan spots the coveted fountain, Baby Cakes tires of filling the chamber, leaving Frank to choose between the castle and the man-child. Despite Reagan's threats, Frank saves his friend, and the two make it out as the castle collapses. Still there at the time, Reagan bathes in the fountain, and after exiting the rubble alive, he announces that he's President for life.