The Gothic Quarter is the centre of the old city of Barcelona. It stretches from La Rambla to Via Laietana, and from the Mediterranean seafront to Ronda de Sant Pere. It’s hard to proscribe a particular run, given the area’s labyrinthine streets and squares. Best to explore on your own (go early to beat the crowds), or do the 1-mile around the wall perimeter. Can be combined with La Rambla, and waterfront running.