One of the last standing gates of the roman walls of León. Right beside the: - "Archivo Histórico Provincial de León" which was once a jail and archive and now a museum. - "Casona de Puerta Castillo" a museum informing you about the city of León's origins as Legio VII Gemina, 75 AD.
Here you can visit a part of the ancient walls of the city of León. There are also two museums close by where you can learn about the roman origins of the city and also the more recent history of the city.
If you visit the "Casona de Puerta Castillo" museum you can walk on top of the wall and see some roman ruins from 75 AD!