The metro of Barcelona is one of the most usually ways to move in the city, also to arrive to the city center. Barcelona has a wide underground system that allows you to move wherever you want throughout the city.
The metro network proper, operated by TMB, consists of 8 lines, numbered L1 to L5 and L9 to L11, and distinguished on network maps by different colours. FGC lines are numbered L6, L7 and L8. None of the Barcelona Metro lines have a name of their own but are generally referred to by their colour or by the number and the names of their termini. The Funicular de Montjuïc, a funicular railway, is fare-integrated and listed on maps as part of the metro network, being connected directly to the metro at Paral·lel station.
There are a lot of metro stations in Barcelona city center. You can see all them in this map. Some of more famous are Plaça Catalunya, Universitat, Urquinaona, Liceu, Passeig de Gràcia…
Although if you sleep in Barcelona City Centre you can arrive to a lot of places walking, metro is the best way to get around Barcelona, according to the citizens of this city, so become a local and get subway everywhere (but don’t forget to take a walk… Barcelona is beautiful walk!)