Calais was a port town in France.
The Spanish Armada was launched from Calais and later defeated by England. (AUDIO: The Flames of Cadiz, The Devil's Armada)
In 1921, the Eighth Doctor and Liv Chenka got off a boat in Calais on their way to Paris to find the Doctor's TARDIS. (AUDIO: The Monster of Montmartre)
On 3 September 1939, Romana II rode the Transcontinental Express from Calais to Vienna. (AUDIO: A Blind Eye)
During World War II, after capturing nearby Boulogne, the German forces under General Heinz Guderian captured Calais in the Nazi Blitzkrieg of May 1940, pushing the British Expeditionary Force back to the last port town of Dunkirk. (PROSE: Timewyrm: Exodus)
In May 1944, an Allied deception campaign lured German forces towards Calais to weaken the defences at Normandy, where the real invasion was targeted. (PROSE: The Shadow in the Glass)
In 2016, a camp for refugees trying to get to England was set up in Calais. Amira and Yana stayed in this camp during their journey from Syria to London. (PROSE: The Stone House)
Rose Tyler suggest that to visit the Moon would be like visiting Calais for the Doctor. The Tenth Doctor acknowledged that the Moon was Calais to the Earth's Dover. (PROSE: I Am a Dalek)