New Grand Canyon

The New Grand Canyon was supposed to be the crater of Springfield when it was blown up by the government, but was stopped by Homer and Bart.

History
After the Simpsons escaped from the dome and moved to Alaska, Russ Cargill tricked the President into agreeing to blow up Springfield. They planned to convert the crater into the New Grand Canyon. After losing his family, Homer was willing to risk his life to foil the EPA's plans. Joined by Bart, who briefly went to stay with the Flanders family, they rode up to the top of the dome and it destroyed with the bomb that was to blow up Springfield.