Art, History & Nightlife, Welcome to Barcelona!
Barcelona is a city small enough to wander about if you are not particularly athletic or keen on walking. Much of the city is pedestrianised with wide pathways and there are no steep hills to contend with so going about by foot is an enjoyable way to see the sights.
Source: http://www.articlesbase.com/hotels-articles/art-history-nightlife-welcome-to-barcelona-5394313.html