11/19/2025
Most visitors never guess that the Louvre sits on top of a medieval fortress. But hidden under today’s museum is the oldest part of the Louvre: the thick stone walls of a defensive castle built more than 800 years ago. These remains are the last traces of a building that once protected Paris long before it became a home for art.
The story begins in the late 1100s, when King Philip II ordered a massive fortress to be built on the western edge of Paris. At the time, the city was vulnerable to attacks, especially from the English during the early phases of the Hundred Years’ War. To protect the capital, the king needed something strong, practical, and impossible to ignore. The result was the first Louvre: a fortress with high towers, deep moats, and an enormous round keep at its center.
The walls you see in these photos are the base of that keep and parts of the surrounding defensive structures. In the 13th and 14th centuries, soldiers walked these halls, stored weapons behind these stones, and kept watch from the towers. This was never meant to be beautiful. Every block had a job: defend the king and keep invaders out.
But Paris changed. As the city expanded outward, the old fortress no longer stood on the edge of danger. By the 1500s, French kings preferred Renaissance comfort over medieval stone. So they began demolishing the fortress and transforming the site into a royal palace. The great tower was torn down, the moats were filled, and elegant new wings replaced the defensive walls.
The transformation continued for centuries. By the time the Louvre opened as a museum in 1793, almost nothing of the original castle could be seen. Everyone believed the fortress was gone forever.
Then, during renovations in the 1980s and 1990s, archaeologists made an unexpected discovery beneath the courtyard: the buried foundations of the medieval Louvre, still standing after hundreds of years. Today, visitors can walk along these walls and see exactly how massive the original fortress was.
These stones are more than ruins—they are a reminder that the world’s most famous museum began its life as a military base. The Louvre did not start with paintings and sculptures. It started with soldiers, moats, and stone walls built to protect a medieval city.
