Calle de Ponzano
Locals will tell you that this street boasts more bars per square foot (nearly 100 in total) than anywhere else on earth. Alternative facts aside, there's a bar for every taste here, from tile-walled tabernas to louche cocktail lounges to newfangled fusion spots. Start with a caña (half-pint) or glass of vermú at a timeworn standby like El Doble (No. 58) or Fide (No. 8) before sampling traditional tapas at Taberna Alipio Ramos (No. 30) or La Máquina (No. 39). More eclectic, refined bites can be found at the tuna-centric DeAtún (No. 59), cheffy Sala de Despiece (No. 11), and modern Basque Arima (No. 51).