"The imposing, white-domed wedding cake now known as Palacio de Bellas Artes was originally planned as a national theater, and construction was begun in 1904. The Mexican Revolution, among other things, postponed its completion until 1934, which explains the stark contrast between its creamy art nouveau exterior (note amazing iron- and stonework with local motifs like serpents) and its art-deco-inspired interior, finished in black and red marbles, and with walls that feature dazzling murals by Rivera, Siqueiros, and other postrevolutionary masters. Today the beloved edifice is home to a concert hall, exhibition areas given over to blockbuster shows, and Mexico ’s National Architecture Museum; take an auditorium tour—or better yet, see a performance—to lay eyes on the theater’s magnificent Tiffany glass "curtain," a mosaic formed (they say) by more than 1 million separate glass components."