What to see in Barcelona in 3 days: day-by-day itinerary

You did not tell me which city you are flying from, so this plan begins where every Barcelona trip really begins: at the arrivals door of Barcelona–El Prat Airport, out on the Llobregat delta southwest of the city. El Prat runs two terminals — T1 for most international and long-haul traffic, T2 for the older, smaller side — and both funnel you into the same warm, loud, palm-tree welcome. Because your landing time is the one genuine unknown of the day, I have deliberately kept this first block free of anything that needs a ticket or a reservation. Nothing on Day 1 breaks if you are two hours late: sorting a metro card, finding the taxi rank and taking a shower are all you have to organise, and the rest of the afternoon stretches or shrinks around you. Land, clear passport control and baggage claim, then take a moment in the arrivals hall before you move. Confirm which terminal your airline used, decide whether your hotel is closest to Passeig de Gràcia, Catalunya or Urquinaona, and agree as a group whether you are splitting a taxi or riding into town. From here, Barcelona does the rest.

Drop the bags and let the flat, sunny grid of the Eixample do the first bit of explaining. This is Ildefons Cerdà's expansion plan made real: long straight streets, block after octagonal block, every corner chamfered so carriages — and now taxis and cyclists — can see around the turn. It is the most orderly quarter in the city, and after a flight it is a gift: you can walk out of your door and know exactly which way the sea is. Allow yourself an hour. Shower, change into something you can walk a few kilometres in, and unpack only what you need for tomorrow. If there is a metro station on your corner, load your T-casual now rather than at 09:00 tomorrow when everyone else is queueing. Then step outside for the first proper look at the city. Depending on your landing time, you are either heading straight into golden hour on Passeig de Gràcia or grabbing an early vermouth at the bar on your corner while Barcelona fills up around you.

Passeig de Gràcia is Barcelona's grandest boulevard, and between Carrer d'Aragó and Carrer del Consell de Cent it turns into an open-air museum of Modernisme. The block known as the Manzana de la Discordia — the Block of Discord — puts three rival architects shoulder to shoulder: Casa Batlló by Gaudí, Casa Amatller by Puig i Cadafalch and Casa Lleó i Morera by Domènech i Montaner. Three families, one street, and an architectural argument you can read straight off the pavement. Stand across the road from Casa Batlló, on the Casa Amatller side, for the full picture. Locals call it Casa dels ossos, the House of Bones, for the stone pillars that look like leg bones and the mask-like balconies; look up and the roof scales into the spine of a dragon, with a turret shaped like the lance of Sant Jordi, Catalonia's patron saint, buried in its back. The façade shifts colour as the light moves — blues, mauves and ochres in a mosaic of broken ceramic that Gaudí's collaborator Josep Maria Jujol helped bring to life. Two hundred metres on, La Pedrera — Casa Milà — is the last house Gaudí completed before he turned full-time to the Sagrada Família: a wave of pale limestone, built between 1906 and 1912 around two interior courtyards, with iron balconies that look like seaweed and a rooftop of chimneys locals call the garden of warriors. This is the evening for façades and atmosphere rather than timed interiors, so the whole walk bends around your arrival time.

A short walk down to Carrer dels Tallers, just off the top of La Rambla, takes you to a piece of Barcelona history: Boadas, opened in 1933 by Miguel Boadas, who learned his trade at El Floridita in Havana and brought the daiquiri habit home with him. The room is tiny, mirrored and standing-room only, and the bartenders still make cocktails in the old measured style — a daiquiri, a dry martini, a negroni, done properly and served quickly. Come here as a group of friends and you will end up talking to whoever is standing next to you, which is half the pleasure. Three or four rounds between you, then a walk home through the Eixample while the streets are still busy, is the ideal soft landing for a travel day: enough of a night out to feel like you have arrived, not so much that tomorrow's Sagrada Família slot hurts. If you want more afterwards, the Gothic Quarter's bodegas are one street away, and nothing on Day 2 starts before 09:00.

Construction began in 1882 under the diocesan architect Francisco de Paula del Villar; a year later a 31-year-old Antoni Gaudí took over and never let go. He worked on the basilica for more than four decades, lived on site for the last stretch, and when he died in 1926 after being struck by a tram he was buried in its crypt — beneath a building that was perhaps a quarter finished. Work has continued ever since, funded by donations and tickets, and the result is the strangest and most ambitious church in Europe. You will approach from the Nativity side, where Gaudí's own carving is at its most tender: birds, plants, donkeys, shepherds and the star of Bethlehem, every surface worked as though it were alive. The Passion façade on the opposite side was carved from the late 1980s onwards by Josep Maria Subirachs in deliberately angular, almost brutal modern forms — the same story told in a completely opposite voice. A third façade, the Glory, is still to come. Inside is the moment everyone remembers. The columns branch like tree trunks holding up a canopy of stone, and in the morning the light pouring through the east, Nativity-side windows washes the nave in blues and greens. Return late in the day and the western windows burn orange and red. It is coloured light used as architecture, and no photograph quite survives it.

Santa Maria del Mar stands over the old Ribera waterfront and it is the people's church: built between 1329 and 1383 in a startlingly short 54 years, largely on the contributions of the porters, stevedores and shipowners of the neighbourhood. The Catalan Gothic shape is wide, plain and luminous, with slender octagonal columns and no crossing transept to block the view down the nave — light and space rather than gold leaf. Look for the relief of the bastaixos, the porters who carried the stone for the church on their backs. The building has been through everything. An earthquake in 1428 shook the rose window down onto the congregation; a fire in 1936 gutted much of the interior, and the church was only fully restored in the 1990s. Set against that, the stone itself has the soft, worn quality of something that has been touched for seven centuries. Walk out to the Passeig del Born, a broad, plane-shaded promenade that was the city's tournament and jousting ground in the Middle Ages and is now the neighbourhood's nightlife spine — busiest after dark, when students and neighbours take it over. At its northern end the great iron market hall has become the Born Centre de Cultura i Memòria, and inside, under the floor, you can walk over the excavated streets of the Ribera, frozen around 1701: the barrio demolished to clear the ground for the Ciutadella fortress after 11 September 1714. This quarter is a layer cake of what the city was, what it was forced to become, and what it is at one in the morning.

Start at the Cathedral of Santa Eulàlia on Plaça de la Seu. The body of the building is true Gothic, thirteenth to fifteenth century, raised over the Roman city of Barcino; but the main façade you see is a late nineteenth-century neo-Gothic addition, begun in 1887 and completed, with its central spire, only in 1913. In the cloister, thirteen white geese live among the orange trees and the fountain, one for each year of Santa Eulàlia's life — she was Barcelona's co-patron, killed at thirteen in 304 AD, and the geese are the city's softest memorial. From there, wander rather than march. Plaça del Rei opens onto the royal palace complex, with the Torre del Rei Martí and the Royal Chapel of Santa Àgata, and beneath the square the Museu d'Història de Barcelona takes you down into excavated Roman streets, workshops and a wine-making plant. A few steps away, the Pont del Bisbe arches over Carrer del Bisbe — one of the most photographed views in the city, and a total fake, built in 1928 as neo-Gothic pastiche for the 1929 International Exposition. Then let yourself get lost in El Call, the medieval Jewish quarter, where the streets narrow to a handshake's width and the city's Jewish community lived and worked until the expulsions of the late fifteenth century. Plaça de Sant Felip Neri closes the loop: quiet, cool, with a fountain and church walls still pockmarked by shrapnel from a Civil War bombing in 1938.

From the cathedral, walk down to the sea — fifteen minutes and the city completely changes. Port Vell is the old harbour, now a pleasure port: yachts, the wooden swing bridge of the Rambla de Mar, the red-brick bulk of Maremagnum and the Columbus monument at the foot of La Rambla. The sixty-metre column went up for the 1888 Universal Exposition with the explorer pointing out to sea, which, as every local will tell you with delight, is not towards America at all. Continue a few minutes east along the water to Barceloneta, the fishing quarter laid out on a grid in the eighteenth century to rehouse the people displaced when the Ribera was demolished — the same story you heard in El Born this afternoon, now with a beach at the end of it. From the Passeig de Joan de Borbó you get the full sweep: the working port on your left, the beach and the Mediterranean ahead, the whole city skyline behind you, and in early May the light holds until well past 20:30. This is deliberately a waterfront evening rather than a beach day. Five barefoot minutes on the sand is wonderful if the mood takes you, but the light is at its best from the promenade, with the wind off the water, about an hour before sunset.

Passeig del Born is where the old jousting ground becomes the night out. The stretch between the old market and Santa Maria del Mar fills up after dark and stays busy late, with everything from small cava bodegas where you stand at the bar for a glass of wine and an anchovy, to cocktail rooms that look like somebody's front room until you ring the bell. Two anchors worth knowing. On Carrer de Rera Palau, Paradiso hides behind the door of a pastrami bar — you push through what appears to be a fridge and end up in a curved, timber-lined space that has repeatedly landed near the top of international best-bar lists; go early, the queue is real. If the group wants dancing rather than talking, Sala Apolo on Carrer Nou de la Rambla is a Barcelona institution for live music and late nights, and Razzmatazz out in Poblenou carries the torch until dawn. Nothing about this needs to be planned in advance, and that is the point. El Born rewards wandering: follow the noise, pick the bodega with the loudest crowd, drink a vermut standing up, then move on to the next one.

Park Güell began as a business idea that failed. Eusebi Güell, Gaudí's great patron, bought the bare hill of El Carmel on the edge of Gràcia in 1900 and planned a garden city of sixty plots — a village of grand houses with a shared square, a market hall and views over the sea. It never sold. Only two houses were built, one of which Gaudí bought himself and lived in from 1906 until 1925; the Casa-Museu Gaudí is still on the site, holding furniture and objects he designed. The park passed to the city and became public, and it has been a UNESCO World Heritage site since 1984. The Monumental Zone is the part you buy a ticket for, and it is exactly as strange and joyful as the photographs promise. The dragon staircase greets you with the mosaic salamander that has become Barcelona's mascot. Above it, a hall of Doric columns holds up an undulating ceiling of white trencadís; it was designed as a covered market for the prospective residents, and the columns double as drains, funnelling rainwater into a cistern beneath the floor. On the roof-terrace above, the serpentine bench curves around the city and the sea in one continuous seat of broken tile, the mosaic work developed by Gaudí's collaborator Josep Maria Jujol. The reward at the top is the view back across Barcelona to the Mediterranean — the best sea view of the whole trip, and you have not spent a beach afternoon getting it. Afterwards, walk down rather than ride: the descent through Gràcia gives you the neighbourhood on foot, and that is where this plan takes you next.

Walk your lunch off on the way back. From Gràcia the streets run gently downhill into the Eixample and eventually reach Passeig de Gràcia, so you arrive at the city's grandest boulevard on foot rather than through a metro tunnel — half an hour of pavements, plane trees and ordinary Barcelona life. Stop opposite La Pedrera one more time, now in flat midday light. Casa Milà looks quite different by day: the limestone façade reads as a cliff face carved out of the block, the wrought-iron balconies by Josep Maria Jujol look like seaweed thrown against it, and you can see how the building has no load-bearing internal walls, just a curving stone skin around a structure that lets the whole thing flex. This is the same block you saw at golden hour on your first evening, and coming back to it in different light is a good way to measure the weekend you have just had. It is deliberately the free, no-ticket version of the visit: nothing to book, nothing to miss if lunch ran long or the taxi is already waiting, and the façades are the part of both houses everyone photographs anyway.

Collect your bags and head southwest to Barcelona–El Prat Airport. Depending on where you based yourself, and whether you choose taxi, bus or metro, the run crosses the Llobregat delta and lands you at T1 or T2 — so check which terminal your airline uses before you set off, because the two are not adjacent and mixing them up is the classic last-day mistake. Give yourself a proper margin: check-in queues on a Saturday in May, security, and the walk to a distant gate all take real time, and both terminals are busy at the same hours. Once you are through, do the last piece of Barcelona properly — a coffee, a plate of jamón, one final look at the departures board to make sure nobody in the group has a tight connection. Then it is over: three days of Gaudí spires, medieval lanes, mosaic benches and seafood, with a short list of things you did not get to. That is the correct way to leave Barcelona.