You can visit the house where Serra's parents lived, a museum devoted to his life and work, the font where he was baptised (in the church of Sant Pere) and a plaque outside the same church describing him as 'explorer missionary hero civiliser'. Anyone walking down the street leading to his birthplace decorated with majolica tiles depicting him baptising Native Americans might be inclined to disagree but by the standards of his day he was certainly a hero.
There is a small hill just outside Petra which has a small church, The Ermita de Bonany. Enjoy the solitude and the views from the top.
The wealth generated from it's agricultural past is shown in the size of its church, Sant Pere, which was built in the 16-17th centuries.
The area around Petra is scattered with windmills, reflecting the relationship Petra has with cereal crops. These days, vineyards also prosper in the fertile lands and you can arrange visits for tours and tastings in advance.