1670 The king demolishes the walls of Charles V and Louis XIII. Paris becomes an open city and remains so for two centuries.
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We might do well to remember on this day that Paris is a city that was surrounded by a series of walls over time. The remains of the last of them — the Thiers Wall — was taken down between 1919 and 1929, when it had become clear to the rest of the world that walls offer only the illusion of protection.
Although the city was founded 2,000 years ago, there's not much left from medieval Paris. After the end of Roman rule (around 500 CE) there were a few centuries of turmoil during which fires and attacks by invaders left very little architectural evidence from the era.
Oldest monuments in Paris: The pillar of the Nautes (1st century) The pillar of the Nautes is to this day the oldest monument in Paris. Preserved in the musée de Cluny, this monumental column is associated with the history of the brotherhood of Lutetia's Nautes.