As the foremost opera venue in the world’s classical music capital, Vienna’s Staatsoper is not to be missed. Productions here are compellingly modern and surprisingly accessible, so expect a full house (even for those five-hour Wagner marathons). Standing room tickets cost less than a cup of coffee and can be purchased up to an hour before the performance. Bring a scarf to mark your spot on the railing, and read along in English on the subtitle screen. As for the dress code, it depends on where you’re sitting: sneakers are an absolute no-go, but nicer jeans are passable in the upper balconies. On the parterre (main floor) expect to be surrounded by more formal attire.