This beautiful city is full of outdoor markets, restaurants, shops, museums, and churches and is fantastic for walking with an extensive and reliable Metro system for more far-flung destinations. And exploring by foot can be very exciting 
The core center of town, focused around the Ciutat Vella provides days of enjoyment for those looking to experience the life of Barcelona. And the beaches was built upon provide sun and relaxation during the long periods of agreeably warm weather.
There are many beautiful places to visit at night in Barcelona, like Musical Fountain, Casa Batlo and enjoy the cuty views in Montjuic Hill.
Enjoy the Harbour Cable Car. The 1450 metre long harbour aerial tramway with red car connects Montjuic and Barceloneta. Miramar viewpoint, a marvelous place in the spring, full of roses and fountains. And there is also a cactus garden nearby.
The Montjuic Castle which provide beautiful panorama views over the rest of the city.
See the flamenco show at Tablo de Carmen.
Try the new Telefèric de Montjuïc cable cars.
Visit thePlaça d’Espanya. This place once used for public hangings, Placa d’Espanya was created for the 1929 World Exhibition. The fountain in the center of the square is a great attraction and plays music during the summer. Plaça Espanya is located at the base of Montjuic mount.
Catalan Archaeological Museum Situated on the Montjuic, it exhibits archaeological findings from Catalunia from different periods.
Barcelona is a very beautiful place, and i would really love exploring it by foot. And take pictures and also blog all about it in here