Reference
OpenAI's Answer
The "rampe en fer à cheval" (horseshoe-shaped ramp) is located in the Cour des Écuries, which is now known as the Cour Lefuel, at the Louvre. This ramp was specifically designed for horses to access the Salle du Manège, a riding school or manege, during the time of Napoleon III. The ramp is noted for its magnificent decoration and historical significance.
For more details, you can refer to the Wikipedia page on Salle du Manège.
Here is an image of the ramp:
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