Giza was a location in Egypt which was the location of three pyramids, including the Great Pyramid and Menkaure's Pyramid, as well as the Great Sphinx.
In the 26th century BC, the First Doctor visited the smallest pyramid of Giza, Menkaure's Pyramid, in the company of Susan, Barbara and Ian. (COMIC: The Forgotten)
In 1400 BC, the Fifth Doctor visited Giza with Peri, where they met Erimem, who subsequently joined the TARDIS as their companion. (AUDIO: The Eye of the Scorpion)
The Fifth Doctor visited Giza in September 1896 in the company of Tegan and Nyssa. (PROSE: The Sands of Time)