The Panthéon stands as a remarkable monument in Paris, originally conceived by King Louis XV as a grand neo-classical church to honor St. Geneviève, the city's patron saint. Its impressive architecture and rich history draw visitors from around the world.
After the French Revolution, the Panthéon was transformed from a church into a mausoleum. It became the final resting place for some of France’s most celebrated figures. The crypt houses the remains of famous philosophers like Voltaire and Rousseau, literary giants such as Victor Hugo and Émile Zola, as well as scientists Pierre and Marie Curie. In 2002, the celebrated writer Alexandre Dumas was also reinterred here, adding to the list of extraordinary personalities honored within its walls.
Inside the Panthéon, a fascinating reconstruction of Foucault’s pendulum swings gracefully, demonstrating the rotation of the Earth—a captivating sight for visitors interested in science and history alike. Those seeking panoramic views can climb the 206 steps to the dome, where the city of Paris stretches out in all directions. Information on guided tours and departure times is available at the main information desk, helping visitors make the most of their time at this historic site.
Source - https://en.wikipedia.org/wiki/Panth%C3%A9on