 La Porte de Neptune, which provides access from the east into the Citadel of Calais | |
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| 50°57′25″N 1°50′31″E / 50.95694°N 1.84194°E | |
| Location | Calais, Pas-de-Calais, Hauts-de-France |
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The Citadel of Calais is a fortress that was initially constructed in the 16th century on the ruins of a medieval castle dating from the 13th century and whose purpose was to defend the city of Calais.