If your trip to Frankfurt is all locked in but your travel itinerary is looking a bit empty, let us give you a helping hand.Experience the best that this place has to offer by adding Maintower and Frankfurt Opera House to your travel schedule. If you have an extra day handy, swing by Alte Oper and Staedel Museum as well.Plan a stop at Frankfurt Trade Fair. It's one sight you'll find on most visitors' to-do lists. If you still have space on that travel itinerary, Romerberg and Zeil Shopping District will keep you entertained as well.