01 Real Alcázar
From €32, and the only ticket in Seville that reliably sells out: timed entry goes days ahead from March to June and again in September. The gardens are half the visit and most people ration the wrong half, so allow two hours. The upper royal apartments are a separate ticket bought on site.
02 Seville Cathedral & the Giralda
One ticket covers both, and the Giralda is a ramp rather than stairs, which is why it is the tower climb people with knees actually do. The cathedral is the largest Gothic church in the world and reads as a series of dark chapels; a guide is what turns it into a building. Free on Monday evenings, and busy accordingly.
03 Plaza de España & Parque de María Luisa
Free, open, and the best hour of the day here is the first one after sunrise or the last before sunset: the tiled alcoves face east and west. Nothing to book. Guided walking tours include it, and that is the only reason to pay anything for it.