Find the must places to see in Viseu

Viseu (Portuguese pronunciation: [viˈzew]) is a city and municipality in the Centro Region of Portugal and the capital of the district of the same name, with a population of 99,274 inhabitants, and center of the Viseu Dão Lafões intermunipical community, with 267,633 inhabitants.
It's 19:44 right now , with clear sky and the temperature of 26.28°C (79.304°F) in Viseu.