Mobile World Congress and the International Technology Forum are holding their conferences here this year, putting the once low-tech city on the high-tech map.
How to get around: The Metro's color-coded lines are easy to use, and tickets work on subways, buses, and trams. A one-way ride costs about $1.70.
Where to find free Wi-Fi: Unlike the chain's U.S. shops, the Starbucks in busy Plaza Catalunya (640 Diagonal; 34-93-405-9024) offers wireless access gratis.
Where to get a trim: Try Dynamic Look (155 Paseo Sant Joan; 34-93-458-6921; dynamiclook.com), which offers cuts for both men ($19) and women ($39).
Best place to get down to business: Have casual meetings at cozy, Italian-style Il Caffe di Roma (107-115 Carrer Tarragona; 34-93-429-4580).
Best place to celebrate closing the deal: Casa Calvet (48-08010 Casp; 34-93-412-4012; www.casacalvet.es), right, is a Catalan-style restaurant in a house originally designed by Antoni Gaudí, Barcelona's favorite architect.
What you might not know: Catalan, not Spanish, is the primary language.