The Elvira Gate was originally part of a fortification, which comprised of a massive monumental outer door, behind which was a smaller door, that led onto L shaped corridors.
This design wasn't so practical in the event of invasion, where the army would have difficulties in leaving en masse. So the fortress was demolished, during the French occupation to leave only the Monumental gate standing.
The actual wooden gate/door was destroyed in the 19th century.
Locals now call this Arcoa de Elvira - The arch of Elvira, rather than Puerte (Gate)
There is evidence from a 17th century engraving, that the gate dates back to the 11th century.
This gate was the Triumphal Archway, through which invaders of the city marched.
The Catholic Monarchs, Isobel and Ferdinand rode through, then centuries later Napoleonic troops entered the city this way.
Apparently rotting heads of executed criminals were displayed from this gateway!!
Passing through the gateway, takes you onto Calle Elvira, with its many shops and bars.
La Puerta de Elvira was the principal gate to the old city. Is known as Arco de Elvira by people of Granada
La Puerta Elvira, de origen árabe, era una de las Puertas de la ciudad, de hecho, era la puerta principal de Granada.
This was the old gateway into the Albaicin (the Arab quarter) and therefore dates back to when the Arabs controlled the city and Andalucia.
It was here that Carlos V swore to respect the privileges uses and customs of the city after the city fell back into Christian hands.
Calle Elvira has come interesting bars and restaurants or you could head up to the Albaicin from here.
Close to Jardines del Triunfo you'll find it. This gate of the IX century was the nothern entrance of the city.