Located in what was once the Puerta de la Feria, the tower of Álvar Fáez is also known as the Cristo de la Feria. Located near the former southernmost point of the wall, it is now enclosed in the Coqun ravine, next to the Alcazar and the Infantado Palace, and at its base lies the park Huerta de San Antonio, modelled after an Arab garden. It is now the site of an information centre explaining the history of the city's heraldic emblem.

It is an ashlar stone masonry tower that is roughly 14 metres in height and has an asymmetrical pentagonal shape. It takes advantage of the height differential presented by the ravine by constructing two floors that are not connected to each other and have separate entrances. From the street level on the building's northern side, a massive round arch doorway provides access to the upper floor. From the west, at the park's edge, a double-arched gateway leads down to the ground floor.

Although the gate and tower were constructed three centuries later, they were given the name lvar Fáez since history has it that it was via this gate that a lieutenant of El Cid invaded to seize the city. Since it was also a hermitage devoted to Cristo de la Feria, it bore the name of both of these saints.

It was not on a major thoroughfare, but it did guard the gateway to the Jewish neighbourhood beyond the city walls. The Academy of Military Engineers took possession of it in 1847, and by 1858, it had mostly collapsed owing to neglect.

It became a National Monument in 1921 and had some repairs in 1928. It wasn't until 1986 that it underwent major renovations to prevent collapse; the interpretation centre wasn't moved in until 2004.