Greece

Greece was a country in Southern Europe, on Earth. Aliens frequently became involved throughout its history.

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

The Doctor claimed to have met the legendary Greek hero Theseus. (DW: The Creature from the Pit, The Horns of Nimon)

The Doctor and June visited Greece in 1500 BC, where they stopped the Slitheen from exploiting the local humans. (NSA: The Slitheen Excursion)

Circa 1200 BC, the Greeks participated in the Trojan War. This was when the first incarnation of the Doctor met Katarina. (DW: The Myth Makers)

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

The Doctor claimed to have visited the very first Olympic Games and watched naked men throwing a discus before a giant crowd. (DW: Fear Her)

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 resembled a Greek trireme and was crewed by Greek sailors. (DW: Enlightenment)

While on holiday in Greece, June met the Doctor and helped him defeat a group of aliens who posed a threat to Athens. (NSA: The Slitheen Excursion)