The buses are double deck; the top floor is uncovered to have a better view of the city. The lower floor is adapted to people with disability or difficulty.
Inside, you will find a guide who speaks at least English. This person will help you and answer any question you may have.

The journey lasts 2h30 and the waiting at the bus stop is fairly short (10-30 min)
The ticket can be bought on the bus, or in the metro stations of Universitat, Sagrada Familia, Diagonal and in the train station (RENFE) at Sants.
With the ticket, you also get a little booklet full of discounts coupons for museums, restaurants, shops etc.

Recorridos

- Ruta Norte (northern Line):

Pl. Catalunya (delante del Corte Inglés) // Passeig de Gràcia - La Pedrera // Sagrada Familia // Parc Güell // Tramvia Blau-Tibidabo // Monasterio de Pedralbes // Palau Reial // Estadio del Fútbol Club Barcelona // Francesc Macià - Diagonal // Pelai - Centro de Arte Contemporáneo.

- Ruta Sur (Southern Line):

Passeig de Gràcia - La Pedrera // Francesc Macià - Diagonal // Estación de Sants // Pl. Espanya // Poble Espanyol // Anilla Olímpica - MNAC // Teleférico - Fundación Miró // Miramar - Costa i Llobera // Colón - La Rambla // Port Vell // Port Olímpic // Vila Olímpica // Parc de la Ciutadella - Zoo // Pla Palau // Barrio Gótico.

Price:

1 day Adults: 20 €  under 12 years old 12 €
2 day s Adults: 26 € under 12 years old 16 €
http://bcnshop.barcelonaturisme.com