At first, the arch was built with wood and plaster.
The lower end of the road is still open, and contains a few arches built during the Depression.
Vast arches, that may have been the gates of the city, are built in the same way.
In 1957, the western towers were completed and the arch over the rose window was built.
In 1357 the arch which connects it with the cathedral was built.
The arches and the dome are built in a good architectural design.
The arch was built with techniques developed by Roman military engineers.
The aqueduct is covered by an arch built of brick.
The current arch is built around a steel frame and concrete, with brick at the base.
The arch was built in brick and lined with ashlar.