Monaco takes music seriously. The Principality’s lavish Opera House sits next to the casino, where its Salle Garnier hosts rock, pop, classical, and opera events—and even hosted the wedding reception of Prince Albert and Charlene Wittstock. Naturally, when guests attend the Opera House for events like 2018's season of Peter Grimes by Benjamin Britten, they dress to impress. For big-hitting pop and DJ events, try the Grimaldi Forum, 10 av. Princesse-Grace (; tel. 99-99-20-00).