If your trip to Colle San Marco is all sorted out but your travel itinerary is a bit on the empty side, we can give you a few hints and tips.Piazza del Popolo is a noteworthy attraction in this fascinating city. Stop by and discover what all the hype is about.Plan a stop at Borgo Medievale di Castel Trosino. It's one attraction you'll find on most visitors' must-do lists. If you still have room on that travel schedule, Piazza Arringo and Cattedrale di Sant'Emidio will keep you entertained too.