It cost €4 to go up to the Mirador (viewing deck), which gives a great relaxed 360 degree view. Queues are short, if at all, and the attraction is well managed. Buy your ticket at the Taquilla window when you arrive, no need to pre-book.
The interesting thing is that this is a Madrid Council centre, but it provides lounges and quiet areas for visitors and citizens to relax, read papers, ask questions of council officials and enjoy their own city. Lovely laid-back Spain at work again.
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