Barcelona is a large city, 101.9 square kilometers in fact. With a population of 1.609 million people! So how can one person hope to see the best the city has to offer? Easy, with a Barcelona bus tour, you can see all the best sites and monuments in Barcelona.Get the hop on hop off bus Barcelona so you can explore any particular location that strikes your fancy! Barcelona was founded, and given the name ‘Barcino’ in the 1st Century BC. Originally enclosed in defensive walls, the city has grown vastly over the centuries. A growing population meant Barcelona had to expand to accommodate its residents.