The Quart Towers or Quart Gate is one of the two fortified gates of the medieval wall of Valencia that are still standing. The complex is made up of two semi-cylindrical towers joined by a central body, where the gate itself opens, in the shape of a semicircular arch. They are located at the intersection of Calle Guillén de Castro and Calle Quart.

The Quart Towers were built by Pere Bonfill, who worked together with the mestres en el noble art de la pedra Francesc Baldomar and Pere Compte in the 15th century, between 1441 and 1460. Tomás Oller and Jaume Pérez were also involved in the works. The style of the towers is late Valencian Gothic military, imitating the Towers or Triumphal Arch of the Castel Nuovo in Naples, designed by the Mallorcan architect Guillem Sagrera, where other masters of the Crown of Aragon intervened when Naples was conquered by the troops of Alfonso V the Magnanimous.

These walled towers have withstood the French War of Independence, the War of Succession, the Cantonal Wars and the Spanish Civil War. You can still see traces of the impacts caused by the cannon fire of the War of Independence on its thick walls, which many people think are caused by the deterioration of the passage of time.

In 1931 they were declared a National Monument, and there is a reference to them in Law 16/1985 on Spanish Historical Heritage.

The Quart Towers are the remains that have survived to the present day of the old medieval wall of Valencia, together with the Serranos Towers, which are open to the north. Other access gates to the city of Valencia were the disappeared gates of San Vicente to the south and the Puerta del Mar to the east or to the port. These gates disappeared in the 19th century, along with the rest of the wall surrounding the old city, by order of the interim civil governor Cirilo Amorós, on the pretext of providing work for unemployed workers, enlarging the city and improving its health.

Since the last decade of the 20th century, parrots and other exotic birds, escaped from their owners, have nested and reproduced in the holes caused by the artillery on the exterior façade. Now in the 21st century, the Cuart Towers are still standing, having undergone a process of restoration of their exterior façade, blackened by the soot of the road traffic that circulates incessantly along Calle Quart and Calle Guillem de Castro.

The Quart Towers are built with lime masonry and cobblestones using the system of encased walls. In the angles, arches and upper flying body, ashlar stones were used. Between the two towers is a gateway leading into and out of the city, topped with a semicircular arch and surrounded by ashlar masonry, which once housed the guardian angel and later the coat of arms of Valencia.

The towers have a cylindrical ground plan towards the outside of the city and are chamfered or flattened towards the inside of the wall, unlike the Serranos Towers, which are polygonal. The towers have a crenellated top with an ashlar terrace. These defensive towers are hardly decorated. The lower part of the tower has a moulding that ends at the ground with a vertical wall in the form of an inclined slope. The cylindrical outer part is smooth to make access to the towers more difficult.

On the side facing inwards towards the city, there are a series of open rooms covered with ribbed vaults. In the centre of the towers, above the arch of the gate, there is a vaulted opening through which those who wanted to demolish it were attacked.

Their position with respect to the old wall is slightly oblique or diagonal, in order to adapt to the layout of Cuart Street, which did not enter perpendicular to the wall, but diagonally.

The late Gothic style of the Quart Towers is repeated in several Italian cities, such as Genoa.