Madrid's Teatro Real is an Opera House which has one of the largest stages in the world and seats up to 1746 spectators. Its annual program features the whole range of operatic styles and genres from the baroque to the contemporary, including the ever-popular works of composers like Mozart, Rossini, Verdi, and Wagner. It also hosts lyric concerts and dance performances. You'll find it close to the Palacio Real (Royal Palace). Tickets are hard to come by, so book early.