If you're passing by Arco de la Carcel, make sure you look up and admire its decorative features and robust design. This historic structure deserves to be viewed from every angle.
You're spoiled for sightseeing choice when spending time in León City Centre. Arco de la Carcel is a great place to begin here, but there are many other worthwhile places to explore. León Cathedral, Convento de San Marcos, and San Isidro Basilica are not far from the historic structure and and will cap off your day nicely.