The Palais Garnier, the national opera house of Paris, is a magnificent building dripping in ornate details and glittering with gold. The five-ton chandelier, made famous in the "Phantom of the Opera," still takes center stage in the auditorium. It is surrounded by a swirling, colorful ceiling painting by Marc Chagall.
The decoration goes beyond the auditorium: The Grand Foyer rivals the Hall of Mirrors at Versailles, and the Grand Staircase is an entryway fit for royalty.
You don't need to buy a ticket to the opera to see the space: Tours are given daily in a variety of languages.