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

The intermediate line of defense was compromised by urban expansion. Its walls were torn by four doors: Ferrada, Porta Nova or Encarnac~ao, Santiago and Bispo. 

http://www.360cities.net/image/elvas-third-defense-wall-bishop-arch-former-city-door-elvas-portugal