360° panorama by Santiago Ribas - 360portugal.
Click the image to open the interactive version.

It was one of the doors on the city walls, torn in 1512, at the time of the Archbishop of Braga, D. Diogo de Sousa. Its current shape dates from 1772, at the initiative of Archbishop D. Gaspar de Braganca, designed by Braga architect Andr'e Soares, in a historic moment when the city was breaking through the old walls, expanding. Next to it is a medieval tower, belonging to the fernandine wall, and practically covered by the houses. Entrance is through the Image Museum.

http://www.360cities.net/image/braga-porta-nova-city-walls-portugal