Troy

Troy was a city located in the far west of ancient Anatolia, part of Asia Minor, later Turkey. It was the site of the Trojan War, fought between the Greeks and Trojans circa 1200 BC. The First Doctor, Steven Taylor and Vicki visited Troy at the end of the war, and were partly responsible for the events leading up to the Greek victory. Here they met Katarina, who left in the TARDIS with the Doctor and an injured Steven, while Vicki stayed behind with the young Trojan Troilus, with whom she had fallen in love. (DW: The Myth Makers)

The Rani had also visited Troy during the war. (DW: The Mark of the Rani)

The Fourth Doctor claimed not to have come up with the idea of the Trojan Horse, though his first incarnation gave this idea to the Greeks. (DW: Underworld, The Myth Makers)