Expect a grand but somewhat cold 19th-century cathedral with impressive scale, decent stained glass, and a museum area that shows the building's construction history. The highlight is usually the view from the dome if you climb up, plus the crypt downstairs. The interior feels more neoclassical than medieval, so don't come expecting the Gothic atmosphere of Burgos or Toledo. A standard visit takes 45-90 minutes; guided tours of the cathedral alone last about an hour and combine well with the Royal Palace next door since they're literally attached.
Best time to go is spring or autumn. Summers are hot and crowded, while winter offers shorter queues but colder interiors. Visit early morning (opens around 10am) to avoid tour groups. Expect to pay around €8-18 total per person: free entry to the main nave, but €6-10 for the museum and dome, or €12-18 for a guided combo ticket with the Royal Palace that includes skip-the-line access.
Pick the dome climb if the weather is clear; the 360-degree views over Madrid and the Royal Palace are genuinely worth it. Skip the audio guide if you're short on time – it's dry. If you're only mildly interested in cathedrals, just walk through the free main area and spend your time and money on the Palace instead. Wear decent shoes for the dome stairs and bring a light jacket even in summer; stone buildings stay chilly.
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