After the Catholic Monarchs took control of the city, changes were made to the entire gateway area. You must ascend a ramp with stairs that terminates at the Arco del Cristo (Arch of Christ) after passing through the main gate and the so-called Puerta de las Columnas.

The tower's upper level has been renovated, and this arch is a curved corridor that has been opened inside of it. A keystone made of gilt stone with a hollowed-out key was carved into the entrance arch, which is bordered by a brick alfiz and supported by pillars. Two stone corbels that protruded from the wall in the top room were proof that there had been a machicolation.

Brick is used to construct the passageway's vaulting. There are remnants of numolitic stone from the 11th-century construction in the jambs of the inner arch. The keystone etched on the keystone of the entry arch serves as proof that the gateway was restored around the end of the 13th century.

Roman concrete walls covered in reddish stucco and small ponds built of slate for the manufacture of garum (the Romans' version of fish paste) have been found in front of the Arco del Cristo's exit door.

One of the more intriguing preserved components is this one. It was given the name Plaza de Armas (Weapons Square) because it is a flat region from which nearly the entire city can be viewed. After the conquest, the cannon was installed there. The Torre de la Vela and the Puerta de La Coracha, which open onto the walled tunnel linking it to the Gibralfaro fortress, are located close by. After the city was conquered, a bell was added to the Torre de la Vela.