You can find out about the history of Petrópolis with a trip to Cathedral of Saint Peter of Alcantara. Amble around the area's rainforest or experience its museums.
Imperial Museum is just one of the attractions in Historic Center, Petrópolis so you might want to stop by during your trip. If you want to experience more of the culture Petrópolis has to offer, head to Cathedral of Saint Peter of Alcantara, House of Princess Isabel, and Crystal Palace.