Mt. Rushmore

Mountian Rushmore (often refered to as Mount. Rushmore) is a location on earth that was used as a plumbers base.

History
See wikipedia page for real life history here: http://en.wikipedia.org/wiki/Mount_Rushmore

Ben 10
In the original series season 1 fanale (Secrets) it was revealed to be a Plumbers base by Max. It was shown to have multiple pieces of technolgy. This technolgy was used to enter Vilgax's ship and rescue Ben.

In Truth it was visited by Phil so he could steal the Null Void Projector. This was because he was making money of his heroics of saving people from aliens but he released them so he could do so and earn money. He however was stopped by Ben, Gwen and Max and sent into the Null Void. It is visited one last time in the day to return the Null Void Projector.

In Ben 10 vs. the Negitive 10 part 1 and 2 Mount Rushmore was seen however only the outer location was seen at the end of part 1. In part 2 the Tennysons tryed but failed to prevent them form breaching the strong hold, So they battled inside the room with the Sub Energy but though defeating and trapping 8 of the Negitive 10 members failed to protect the sub energy. However Ben as Upchuck stopped the Forever King by swallowing the energy and making a powerful blast. However this destroyed Mount. Rushmore and a halogram was used to prevent anyone from seeing the damages.

Ben 10: Protector of Earth (Alternate Timeline)
In was a level in the video game Ben 10: Protector of Earth

Ben 10: Ultimate Alien
It was revealed that over the course of the original series, Alien Force and Ultimate Alien it was repaired (liklyby the plumers). However it was damaged again by Lucubra Vilgax (by ripping off one of the faces to infultrait the base) and the Esoterica. It is unknown if it was repaired after this.

Notable Pieces of Technolgy
Various V
 * Null Void Projector
 * Large Powerful Blaster Cannon
 * Other Various Pieces of Alien Tech

Ben 10

 * Secrets (first appearance)
 * Truth
 * Ben 10 vs. the Negative 10: Part 1
 * Ben 10 vs, the Negitive 10: Part 2 (damaged and mostly destroyed)

Ben 10 Ultimate Alien

 * The Ultimate Enemy: Part 2 (first reappearance) (damaged)

Trivia

 * Mount. Rushmore is one of the famous locations of the 3 Ben 10 series to be damaged/destoryed. Another being Stonehenge which was destoryed in the alternate timeline movie "Ben 10: Destroy All Aliens" during Ben's battle with Retaliator.