Opéra Garnier is officially the biggest opera house in Europe and arguably the most extravagant. Standing as one of the most stunning examples of Baroque architecture, the building was inaugurated in 1875 and named after the ambitious architect who designed it, Charles Garnier. Since opening almost 150 years ago, Opera Garnier has been the go-to place for Paris’s high society. A night at the opera also serves as the perfect excuse to splash out on a special outfit. Head to Champs-Elysées and wander around the high-end boutiques to find the perfect evening wear before mixing it with the city’s power elite. You don’t have to see a show to make a visit worthwhile. Many come just to marvel at its extravagance and learn about its history on a private guided tour.