Peru was a country in South America.
Circa 1000 BC, the Exxilon visited Earth and helped build temples in Peru. The Doctor saw Exxilon markings on the walls of one temple. (TV: Death to the Daleks)
In 1910, the Doctor witnessed earth tremors in Peru. (PROSE: The English Way of Death)
In the 1970s, Sarah Jane Smith wrote an article criticising tourists who didn't respect native customs in Peru. (PROSE: To Kill a Nandi Bear)
Entek, a Ra'ra'vis chrononaut, travelled to Cuzco, Peru in 1992 through a time corridor and was found there by the Eleventh Doctor. (COMIC: Time Fraud)
In the early 21st century, a young Peruvian woman came to New York City hoping for a better life, but ended up living in one of the inner-city housing projects. Three weeks after her arrival, she was arrested for prostitution, and when it was learned that she was healthy, the Butler Institute harvested her lungs and transplanted them into Stephanie. (PROSE: Cat's Cradle: Warhead)
In 2009, Alistair Gordon Lethbridge-Stewart was stranded in Peru and thus unable to assist UNIT in the Sontaran invasion of Earth. (TV: The Poison Sky) He later returned to Britain for a while (TV: Enemy of the Bane) but later returned to Peru and was unable to attend Sarah Jane Smith's wedding to Peter Dalton. (TV: The Wedding of Sarah Jane Smith) He was still in Peru at the time of the Eleventh Doctor's supposed funeral and so was unable to attend. (TV: Death of the Doctor)
When the Eleventh Doctor, Amy Pond and Rory Williams put on ponchos for warmth, Amy said that they looked like a Peruvian folk band. (TV: Amy's Choice)
The Eleventh Doctor and Amy Pond once visited an Incan temple in Peru, where they met the Cybermen. (GAME: The Mazes of Time)