Peru is 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. (DW: Death to the Daleks)
In 1910, the Doctor witnessed earth tremors in Peru. (MA: The English Way of Death)
In the 1970s, Sarah Jane Smith wrote an article criticizing tourists who didn't respect native customs in Peru. (ST: To Kill a Nandi Bear)
In 2009, Alistair Gordon Lethbridge-Stewart was stranded in Peru and thus unable to assist UNIT in the Sontaran invasion of Earth. (DW: The Poison Sky)