I've only spent a long weekend in the Madrid area, so I can't offer much in Spain, but that pilgrimage route looks pretty sweet. I'll have to check that out at some point.
Madrid's got some cool stuff though like the Prado Museum. Go see some gangster paintings like Goya's Saturn Devouring His Son and the Triumph of Death. Those paintings are metal as fuck.
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From Madrid i've done a few day trips. Segovia is well worth a visit. It has a really nice old Roman aqueduct, picturesque castle, cathedrals, and nice city walls.
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Avila is another cool town for day trip. Has a really well preserved city wall from the Roman Era.
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That's about all I got on Spain for now. Once travel opens up I have some work trips planned to Madrid, Barcelona, Seville, and even Lisbon I'm looking forward to, but for now all I can do is dream. Man what i'd do for some legit paella.