Panthéon
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The Panthéon is a monument in the 5th arrondissement of Paris, France. It stands in the Latin Quarter, atop the Montagne Sainte-Geneviève, in the centre of the Place du Panthéon, which was named after it. The edifice was built between 1758 and 1790, from designs by Jacques-Germain Soufflot, at the behest of King Louis XV of France; the king intended it as a church dedicated to Saint Genevieve, Paris's patron saint, whose relics were to be housed in the church. Neither Soufflot nor Louis XV lived to see the church completed.
The Panthéon
Soufflot's plan of the three domes, one within another
Looking upward at the first and second domes
Iron rods were used to give greater strength and stability to the stone structure (1758–90)
Foucault pendulum
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The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault, conceived as an experiment to demonstrate the Earth's rotation. A long and heavy pendulum suspended from the high roof above a circular area was monitored over an extended time period, showing that its plane of oscillation rotated.
A print of the Foucault Pendulum, 1895
An excerpt from the illustrated supplement of the magazine Le Petit Parisien dated November 2, 1902, on the 50th anniversary of the experiment of Léon Foucault demonstrating the rotation of the earth.
Foucault pendulum at the Musée des Arts et Métiers