New Mexico

New Mexico was a state of the United States of America in which could be found the town of Roswell. (PDA: The Devil Goblins from Neptune) Near Roswell lay Area 51, a top-secret American military base for the retention and study of aliens and their artefacts. The tenth Doctor visited the state in 1958 as a "guest" of Colonel Stark of the United States military. There, he and a couple of Nevadan friends, Cassie Rice and Jimmy Stalkingwolf, dealt with a Viperox threat. (DW: Dreamland)

It was also home to Los Alamos, the town closest to "the Hill", the American base for testing nuclear weapons during and after World War II. The seventh Doctor and Ace visited there in 1945 and opposed the machinations of Lady Silk. In order to get to Los Alamos, however, the Doctor and his companion first had to pass through the town of Lamy, where the duo were forced to leave the TARDIS. (PDA: Atom Bomb Blues)

On a separate adventure in October 1957, the seventh Doctor, Ace and Benny visited the White Sands Proving Grounds to view the launch of an Atlas missile. They also spent time canvassing the opinions of locals about strange goings-on at the Proving Grounds. Thus they spent some time in the town of Alamagordo as well. While there, Benny was offered the chance to go see Carlsbad Caverns, but she declined in favour of the chance to explore an Anasazi pueblo. (NA: First Frontier)