Walking is essential for urban sustainability and quality of life in any city, yet little is known about how pedestrians actually get around in public, or what urban and social factors influence their ...

So you’re planning a trip to Barcelona? Maybe you’ve heard whispers of Gaudí’s dreamy architecture, or perhaps you’re chasing the promise of sun-soaked beaches and plates piled high with tapas.

Add Yahoo as a preferred source to see more of our stories on Google. Local experts suggest how to explore the coastal city. This sight is well worth queueing up for — or, buy your ticket in advance ...