Greece

Greece was a country in Europe, on Earth. It had plenty of alien involvement throughout it history, including:


 * In ancient times, the Immortals were worshiped as gods by the Greeks. (PDA: Deadly Reunion)


 * Circa 1200 BC, the Greeks participated in the Trojan War. (DW: The Myth Makers)


 * Greek civilization was influenced by the Dæmons and Scaroth. (DW: The Dæmons and City of Death)


 * The Greek philosopher Bigon was abducted by the Urbankans. (DW: Four to Doomsday)


 * The Doctor claimed to have met both Alexander the Great and Pyrrho. (DW: Robot, The Keys of Marinus)


 * One of the ships used by the Eternals in their contest for Enlightenment was a Greek trireme. (DW: Enlightenment)