The Tenth Doctor and June visited Greece in 1500 BC, where Athens would later be built. They later visited the city near the height of its power. (PROSE: The Slitheen Excursion)
History
Early history
Athens and Sparta were at war for many years during the 5th century. Their conflict ended in 421 BC. (AUDIO: The Oracle of Delphi, Mask of Tragedy) However, they were at war again by 410 BC. (COMIC: The Chains of Olympus)
In 421 BC, the Seventh Doctor, Ace and Hector Thomas encountered Aristophanes in Athens. (AUDIO: Mask of Tragedy)
The Sixth Doctor claimed to have at some point visited the Parthenon in Athens, while it was being built. (AUDIO: The Spectre of Lanyon Moor)
The Eleventh Doctor, Amy Pond and Rory Williams visited Athens. (COMIC: The Chains of Olympus)
The Fourth Doctor took Leela to Athens to see a play by Aristophanes. (PROSE: The Brain of Socrates)
20th century
Information from The Spectre of Lanyon Moor
In 1966, the city was a destination of the villainous Chameleon Tours. (TV: The Faceless Ones)
During the communications blackout from Recovery 7, Athens observatory reported a massive solar flare build up. (TV: The Ambassadors of Death)
21st century
In the early 21st century, Baskerville predicted that Athens would be devastated by a tidal wave, and planted a bomb to ensure that this would happen. (PROSE: Trading Futures)
In the mid- to late 21st century, Athens had a T-Mat centre. (TV: The Seeds of Death)