A group of visitors is frozen in time at the steps of the Pantheon, a famous Neoclassical building in Paris. Barely visible horses, carriages, and sightseers give an awe-inspiring sense of scale to the scene. Louis-Alphonse Poitevin observed the enormous edifice – 72 feet high and 276 feet wide – from the roof of one of the buildings that faced it. Begun in 1757 as the Church of Sainte-Geneviève, the Pantheon is now a civic building housing the remains of some of France's most famous citizens.