Lisbon is the capital of Portugal and a popular tourist destination, known for sites like the Tower of Belém, Terreiro do Paço, and Castle of S. Jorge. Porto is an interesting city along the Douro River, with popular attractions including the Cathedral of Sé, Camar city, and D. Luis. Évora is a historic city with good places to visit such as the Temple of Diana, Walls of Évora, and municipal buildings. Coimbra is a university city with gardens and sites like the University of Coimbra, Castle of Coimbra, and municipal government offices.