Constructed in the Neo-Mudéjar style, the arch is made of reddish brickwork and adorned with decorative stone carvings. The front frieze showcases Josep Reynés' sculpture "Barcelona rep les nacions" (meaning "Barcelona welcomes the nations" in Catalan), while the opposite frieze displays "Recompensa" (or "Recompense"), a stone carving by Josep Llimona depicting the award ceremony for participants in the World Exposition. On either side of the arch, there are friezes depicting allegories of agriculture and industry by Antoni Vilanova, and trade and art by Torquat Tassó. The pillars of the arch are decorated with stone carvings of bats, symbolizing King Jaume I, who presided over a prosperous era in Barcelona.
Many other cities have structures that bear similarities to this one, such as Paris' Arc de Triomphe, London's Wellington Arch, New York City's Soldiers' and Sailors' Arch, Bucharest's Arcul de Triumf, as well as several from the Roman era. Unlike its military-themed counterparts, this arch was constructed as the entrance to the 1888 World Fair and therefore serves as a welcoming gateway rather than a tribute to the nation's military triumphs.