Fodor's Expert Review Acueducto Romano

Segovia's Roman aqueduct is one of the greatest surviving examples of Roman engineering and the city's main sight. Stretching from the walls of the old town to the lower slopes of the Sierra de Guadarrama, it's about 2,952 feet long and rises in two tiers to a height of 115 feet. The raised section of stonework in the center originally carried an inscription, of which only the holes for the bronze letters remain. Neither mortar nor clamps hold the massive granite blocks together, but miraculously, the aqueduct has stood since the end of the 1st century AD.