One of the main sights in Zaragoza. The wall, built between the 1st and the 3d century AD, is 3,000 m-long and has about 120 defensive towers.
Wikipedia https://fr.wikipedia.org/wiki/Muraille_romaine_de_Saragosse
Address 6 Calle de las Murallas Romanas, Zaragoza 50003, Spain
Coordinates 41°39'25.833" N -0°52'54.417" E