Located in a corner of Plaza de Catedral, this arch is another pretty old landmark in Cádiz. Can't…read morego inside, can't climb it, etc. just for taking pics and touching really old stone. Still pretty cool!
Arco de la Rosa (Arch of the Rose), dates to the 13thC.
There is conflicting info about this arch, from Wiki vs tourism sites. I would trust the Spanish to know their own stories (thus the tourism sites win for me), but to go by the actual plaque on the wall, beside the arch, here's a loose translation:
"This arch, called rose, named after the image of the virgin that it housed in its niche, is part of the Medieval wall. It [the wall] was ordered by Alfonso X the Wise (1221-1284), to be built to reinforce the city, when [he was] reconquering this city in 1262.
"The literary, artistic, and scientific athenaeum (institutions) of Cádiz, in tribute to, and memory of that same king, to whom this city owes so much, dedicate this plaque on March 28, 2006."
(español)
"Este arco llamado de la rosa por la imagen de la virgen que albergó en su hornacina pertenece a la muralla Medieval. Se mandó reforzar por Alfonso X el Sabio (1221-1284) al reconquistar este ciudad en 1262.
"El ateneo literario, artístico, y científico de Cádiz, en homenaje y memoria de aquél rey, a quien tanto debe este ciudad, colocó esta lápida el 28 de marzo de 2006."