Sagrario Church is not just a place of prayer, but a worthwhile attraction as well. Make the pilgrimage and enjoy some moments of quiet contemplation.
You'll have no end of sightseeing choices in Historical Center. Sagrario Church is a great place to start here, but there are numerous other interesting sights to consider. Seville Cathedral, Alcázar, and Plaza de Españan are close to the house of prayer and will fill in your day nicely.