Mexico City, Mexico

Mexico City's streets function as the world's largest open-air restaurant, with over 10,000 taquerías alone. A taco al pastor from a spit at 2 AM costs roughly $1.50, and the city's more than 1,000 distinct street food dishes dwarf the variety found in Penang, which offers around 300. The abuelas in mercados serve tlacoyos for $1.20 each, and esquites cups cost $1.00.