Mount Rushmore

Mount Rushmore is a national monument and tourist attraction in South Dakota, famous for having the faces of four U.S. Presidents carved on the side of the mountain. From left to right, the Presidents who appear on the mountain are:
 * George Washington
 * Thomas Jefferson
 * Abraham Lincoln
 * Abraham Lincoln

History
A man was trying to bribe senator Bob Arnold to get the rights to drill for oil in Roosevelt's head on Mount Rushmore. Arnold accepted this bribe, however, it was part of an FBI sting operation and the man trying to bribe Arnold was actually an FBI agent.

When planning their next vacation, the Simpsons decide to go to North Dakota since it is the only state that they are allowed to enter. Bart then gets excited because he wants to see Mount Rushmore, but Lisa points out that the monument is in South Dakota.

While driving Bart to a disciplinary camp in northern Oregon, Homer passes a sign that reads "Mount Rushmore - 20 feet out of your way!"

When Otto abandoned the school bus during a field trip, Homer took over the driving and took the group to Mount Rushmore, where he explained that the Presidents' heads had been built large-sized and in stone to scare off aliens.

Homer once had a political talk show, Gut Check with Homer Simpson, where one of his trademarks was going on tirades where he bemoaned the erosion of American values and warned of the possible consequences. During one tirade, he displayed a picture of Mount Rushmore, then showed the faces of the Presidents being replaced by, , the , Patty and Selma.

When the Simpson family visited Mount Rushmore, Bart vandalized George Washington's head so that it ended up looking like Krusty the Clown.

Non-canon
During the montage of Lisa chasing Bart with a knife, one of the locations seen in the pursuit is Mount Rushmore.

Six months after Bart defeats the Space Mutants, becoming an intergalactic hero, the Simpsons family visit Mount Rushmore, where the monument now features a carving of the head of Bart Simpson added next to the carving of George Washington.