In Zaragoza, there is a historic monument called the Puerta del Carmen.

The Puerta del Carmen, which was constructed in 1789 by architect Agustin Sanz and opened in 1792, is neoclassical in design. It now stands alone on Paseo Mara Agustn in Zaragoza and was once one of the city's twelve entrance gates (there were four Roman and eight mediaeval ones).

A central arch and two smaller lateral arches give the doorway the appearance of a Roman triumphal arch. Despite not having much architectural interest, it is historically significant since it has seen significant city-related events. The gate functioned as a stronghold for the Aragonese resistance throughout the war of the sieges (1808–1899), and the effects of the projectiles are still evident in its architecture. During the First Carlist War in 1838, the army again entered the city through this gate.

Anecdotally, a bus struck the monument on February 23, 1997, early that morning, displacing numerous ashlars and putting its stability in jeopardy. To prevent further accidents, the gate was properly repaired, and safety features were put to the roundabout.

At the Spanish-French exhibition in 1908, the Puerta del Carmen was designated a national monument and is now a property of cultural interest.