Centered in one of the finest natural ports in the world, which has been utilized since Roman time, Vigo now claims to be the largest fishing port in the world. Overlooking the city is the 17th century Castro Fortress, which was intended to protect the city from invaders, but proved lacking. The historic Cidade Vella, is centered around the old maritime quarter of O Berbés, near the port. Here, among the network of tiny streets is the Collegiate Church of Santa María. Built in the Neoclassical in style, it stands on the rubble of a Gothic church burned down by the pirate Francis Drake. But if you only do one thing in Vigo, make sure you visit the unmissable Pedra market, just north of the church. A fascinating experience, the famed ostreiras, or female oyster sellers, offer visitors fresh Galician oysters to slurp on the spot.