If you want a serene place to spend a little time, pay a visit to Basilica of Nuestra Senora de Atocha. This holy sanctuary offers the perfect break from a jampacked travel schedule.
You'll be spoiled for sightseeing choice when visiting Retiro. Basilica of Nuestra Senora de Atocha is a good place to kick off here, but there are loads of other worthy places to experience. Plaza Mayor, Prado Museum, and Santiago Bernabéu Stadium are close to the house of prayer and and will cap off your day nicely.