It’s more than likely that you’ll be staying near the Ramblas on your stay in Barcelona. It will be central to your daily activity and nights out. It is a long boulevard which joins the Monument a Colom (Columbus monument) by the port to Placa de Catalunya. All day long you’ll find all kinds of buskers and mime artists in action as well as stalls selling flowers, newspapers, birds and rabbits. Look out for Palau de la Virreina, a grand 18th-century mansion, which is next to the Boqueria market.
The Boqueria market (Mercat de la Boqueria) is one of Europe’s great food markets, and is well worth well worth a visit. It’s a good spot to visit at breakfast time for excellent Spanish tortilla at one of the internal bars near the back. Further south is Barcelona’s Opera house (Gran Teatre del Liceu) after which the Ramblas begins to get seedy as you approach the sea with peep shows and the like. La Rambla ends at the Columbus Monument which you can go up in a lift for spectacular views up the Ramblas and across the harbour.