La Rambla is the most famous street in Barcelona, packed with tourists and people stealing from your pockets! It has a large central pavement, and narrow side pavements on both sides. The street is full of shops, but it also has quite a lot of attractions. Among the sights to see:
Canaletas: Here you can find a water fountain, and if you drink from it you will for sure return to Barcelona one day.
Betlem Church: One of the few buildings in Barcelona built in Baroque style, from the 18th century. Most of the inside was destroyed during a fire at the beginning at the Spanish Civil War.
Columbus Monument: This is in the end of La Ramblas and it was raised in 1988.
Besides these sights every visitor should notice “Joan Miru Mural”, “Gran Teatre Del Liceu” and “Placa Reial”. But, as mentioned earlier, take good care of your valuables, as there are a lot of pick-pockets in the area (and in all of Barcelona).