The panorama was the IMAX theater of the 19th century; its sweeping, wraparound paintings brought to life scenes of epic proportions. The Bourbaki is one of only 30 remaining in the world. Painted by Édouard Castres between 1876 and 1878 (he was aided by many uncredited artists, including Ferdinand Hodler), it depicts the French Army of the East retreating into Switzerland at Verrières, a famous episode in the Franco-Prussian War. As you walk around the circle, the imagery seems to pop into three dimensions; in fact, with the help of a few strategically placed models, it does. There's a recorded commentary in English. A modern glass cube filled with shops, movie theaters, and a restaurant surrounds its conical wooden structure.