Both the fountain and the ceramic representation of Barcelona's second set of walls and the early Rambla are worth studying carefully. If you can imagine pulling out the left side of the ceramic scene and looking broadside at the amber yellow 13th-century walls that ran down this side of the Rambla, you will see a clear picture of what this spot looked like in medieval times. The sandy Rambla ran along outside the walls, while the portal looked down through the ramparts
into the city. As the inscription on the fountain explains, the Porta Ferrica, or Iron Door, was named for the iron measuring stick attached to the wood and used in the 13th and 14th centuries to establish a unified standard for measuring goods.
Rambla and Carrer Portaferrissa, Barcelona, Catalonia, 08002, Spain