Garnier Opera House in Paris

When Chris and I were in Paris at the end of December, he mentioned that he'd love to go take a tour of the Garnier Opera House - or the Palais Garnier, as it's called in French. "Opera??" I said, giving him a "since when do we go to the opera??" look. He said it was supposed to be just about the most beautiful building in the world and that if it weren't the holidays, making prices jump, he would've bought tickets to see a show. "Alright, let's go see the opera house," I said...