Jardin des Tuileries. Arc du Carrousel in the background. Haha in foreground, cordoned off for your safety.

But where's the merry-go-round, I wondered? "Carrousel," I find, once meant a kind of equestrian spectacle, with costumed horses dancing and performing pantomimes. They were popular in the 1600's. Henri IV held one that included two elephants, at midnight, by torchlight, in the courtyard of the Louvre. The courtyard became known as the Cour du Carrousel.

Centuries later, Napoleon celebrated himself with a "small" triumphal arch there in front of his house, the Tuileries. Not "the" Arc de Triomphe, but l'Arc de Triomphe du Carrousel. Nowadays, there's an underground shopping mall in the same area, the Carrousel du Louvre.