Rem Koolhaas designed it as one terraced hall embracing a million books in a single gaze: Qatar National Library in Education City — and sunk at its heart the Heritage Library: rare manuscripts, maps and Qurans in a marble excavation like an opened treasure. Visitor entry is free and an awed hour fits; the Heritage Library below crowns it for manuscript lovers; pair with an Education City loop and the nearby suspended masterpiece of the Qatar Faculty mosque.