El Rincón de Jerez

Out in the eastern reaches of Salamanca, the Andalucian bar El Rincón de Jerez is utterly unlike anywhere else in Madrid. At 11pm from Tuesday to Sunday, they turn off the lights, light the candles and sing as one La Salve Rociera, a near-mythical song with deep roots in the flamenco and Catholic traditions of the south. It'll send chills down your spine.