Stout walls, 42 feet [13 m] high and up to 20 feet [6 m] thick ​ — as well as two massive fortresses — ​ testify to the extraordinary effort made by the people of San Juan to protect their city.
Tugevad, 13 meetri kõrgused ja kuni 6 meetri paksused müürid ning kaks massiivset kindlust annavad tunnistust sellest, milliseid erakordseid pingutusi tegid San Juani elanikud oma linna kaitsmiseks.