The Panthéon rises 83 meters above the Sainte-Geneviève mountain in Paris, a neoclassical dome that began as a church in 1758 and became the Republic's mausoleum for distinguished French citizens. You see it from blocks away, the stone façade pale against the sky. Inside, the air is cool and the scale immense—columns soar, light filters through high windows, and your footsteps echo across marble.
Architect Jacques-Germain Soufflot designed the structure, blending the lightness of Gothic engineering with classical symmetry. [VERIFY: specific completion date and when it transitioned from church to mausoleum]. The building stands as both architectural achievement and national symbol, housing the tombs of figures who shaped French history, science, and letters.
You enter the main hall and the dome opens overhead, vast and geometric. Descend to the crypt and the temperature drops—vaulted corridors lead past stone sarcophagi, each name carved in the dim light. If you climb to the colonnade, Paris unfolds in every direction, rooftops and spires stretching to the horizon. Foucault's pendulum swings in the nave, tracing the Earth's rotation in slow, hypnotic arcs.