Almudena Cathedral
At the opposite end of the Sabatini gardens, just opposite the Palacio Real, we find the Catedral de la Almudena.
While the cathedral is very colorful and free to visit, we recommend you to pass-by the Sacristy and Crypt, the latter with entry on number 90 of Calle Mayor. The entry costs a contribution of €1, which is very worthy, so we recommend you not to miss it.