When you arrive in Seville for a long weekend (three days are an ideal measure) you are literally dominated by the amount of churches and monuments that you would have to see. So many (and often so crowded) that one risks getting lost and returning home with the unpleasant idea of a city overwhelmed by tourists.
Yet it is enough to take a few steps and leave the monumental area between the Cathedral, the Real Alcazar and the district now completely devoted to tourism of Santa Cruz , which Seville takes shape and shows the great desire to live of its inhabitants. Sivigliani that at any time of the day (except between 3pm and 5pm, when they all religiously take siesta) crowd every public space, remaining for hours at the bar counters to drink and chat endlessly with that particular accent of theirs, the Sevillian, which makes you seem to be in another Spain, where oranges grow on the street (but don't touch them). In https://www.etia.com/ you can have all the visa options for you.
A building that in itself is nothing exceptional, just a step away from the cathedral, houses the Archivio General de Indias which have kept all the documents from the Spanish Conquest of the Indies, which was then South America, for centuries. A couple of hours of instruction, and free, to browse three reproductions of the documents signed by Columbus and Queen Isabella, by Cortez and by the other generals who put the New Continent on fire.
The basilica of the Macarena is not even too large a church built in 1949 to house the statue of the Virgen de la Esperenza to which the Sevillians are many devotees. The neighborhood around is still little beaten by the crowds of tourists and is one of the areas of the center that preserves the soul of the city and where one can better observe the life of the Sevillians in an incessant shuttle between shops and bars. In the area for lunch it is worth taking a trip to the Mercado das Feiras , which is not yet a victim of the "Master Chef" effect and allows you to taste fresh fish tapas and wine for € 3. Just behind the market is the Centro de Arte Mudéjar, a palace where you can learn a lot about the rich Arab heritage in the city's architecture.
You say Seville and think of flamenco, or the barber. There are very few barbers around, but flamenco is omnipresent. Thematic souvenir shops, show boards, small museums. The price for the most touristic shows is everywhere the same: 18 euros for a show of an hour and a half. Otherwise you have to look for the peñasflamencas in the different districts, including Triana, here late in the evening, always well after 11pm, dancers of all sorts perform. A place to be on the safe side (and see a show in the early evening, between 18 and 22) is the Casa de la Memoria, in the center.