If your trip to Settimo San Pietro is all sorted out but your travel itinerary is looking a little empty, let us give you a helping hand.If anyone asks why you're heading here, just show them some images of National Archaeological Museum and Roman Amphitheatre of Cagliari. These wonderful attractions will ensure you have an awesome trip.Not too far from the city center, Cagliari Observatory is one spot you might like to add to your to-do list. Cagliari and Devil's Saddle Tour and Church of San Pietro di Ponte are also not far away and worth taking the time to see.