The old city of Barcelona is roughly a kilometre across and takes most visitors a full day, because the interest is not in the distance but in the number of times you stop. It is also the part of the city that is most misread: a lot of what looks medieval is, some of it is Roman under your feet, and a famous handful of it was invented in the 1920s. Here is a route that takes in the real thing and the invented thing without pretending they are the same.

The route, in order

Start at the cathedral, in the square in front of it, early enough that the square is still empty. The facade is the theatrical one that was finished long after the rest of the building, and the cloister behind it with its geese is the better half.

The Roman wall fragments built into the buildings around the square and behind the cathedral, which are the oldest thing you will touch here.

Plaça del Rei, a stepped medieval square with nothing in it, which is the single most atmospheric spot in the quarter and is usually quiet.

The bridge everyone photographs on Carrer del Bisbe, which is not medieval and was built in 1928. Photograph it anyway.

Plaça Sant Felip Neri, a small enclosed square with a fountain and a church wall scarred by shrapnel from a Civil War bombing. Read the plaque before you photograph it.

Across Via Laietana into El Born, which is where the character changes.

Santa Maria del Mar, the merchants’ church, which is the finest interior in the city and is free to enter outside the paid tower hours.

The Born market ruins, an iron market hall with an excavated eighteenth century street preserved underneath it, which is free to look down into.

What the two halves feel like

The Gothic Quarter is stone, shade and religion: the cathedral, the old government buildings, the squares that used to be cemeteries. It is also the busier and more heavily trafficked of the two, and its main axes are the most crowded streets in Barcelona.

El Born is brick, iron and commerce: the merchant church, the market hall, and a grid of narrow streets that now hold independent shops, wine bars and small galleries.

The dividing line is Via Laietana, a wide traffic street cut through the old city in 1908 that destroyed a good deal of what was there. It looks like a natural boundary and is actually a wound.

Both are residential, which is worth remembering at night. People live above every one of these bars.

What to go inside

Santa Maria del Mar first, if you only go inside one thing. The interior is bare, tall and wide, with almost no decoration, and it is more affecting than anything in the cathedral.

The cathedral cloister, for the palm trees, the fountain and the thirteen geese kept there.

The city history museum at Plaça del Rei, which takes you down into the Roman streets under the square. This is the best value archaeology in the city.

The Picasso museum, a few streets into El Born, which occupies five medieval palaces and holds the early work rather than the famous work.

The Born ruins, free, which show a street the eighteenth century army demolished to build a fortress.

A narrow stone street in the Gothic Quarter of Barcelona, Spain

Practical notes

Pickpockets are a genuine and constant issue here rather than a rumour, concentrated on the crowded axes and around the cathedral. Nothing in back pockets, bags closed and in front.

Shoes matter more than people expect: the paving is uneven stone and the route is longer than the map suggests once you add detours.

Shade is plentiful, which makes this the right neighbourhood for a hot afternoon and a poor one for a cold windy morning.

Sunday closes a lot of shops and opens up the streets, which suits a walking route.

Restaurants on the main axes are almost entirely tourist trade. Two streets off them, this is not true.

Where this fits in a Barcelona trip

The old city is the first walk most people do and the one they underestimate.

For how the rest of the city is laid out and which area to actually sleep in, our guide to Barcelona’s neighbourhoods covers the whole map.

For the neighbourhood that feels the way people hope the old city will feel, without the crowds, our guide to Gràcia covers the squares and the streets worth an afternoon.

And for the two museums that sit at either end of this walk, our guide to the Picasso and Miró museums covers which one suits which visitor.

The Gothic interior of a church in Barcelona's old city, Spain

The short version

Walk the old city early, before ten, and take the route from the cathedral through Plaça del Rei and across Via Laietana to Santa Maria del Mar and the Born ruins. Go inside Santa Maria del Mar and the Roman level under Plaça del Rei, and treat the famous bridge as the 1928 stage set it is. Keep your bags in front of you on the crowded axes, eat two streets off them rather than on them, and if you are taking a walking tour, take it on your first morning rather than your last.