Luminous in León -- In the church-building frenzy of the Middle Ages, every Gothic cathedral vied to distinguish itself with some superlative trait. Milan Cathedral was the biggest, Chartres had the most inspiring stained-glass windows, Palma de Majorca had the largest rose window, and so on.

Structurally, though, the boldest cathedral was at León. This edifice set the record for the highest proportion of window space, with stained-glass windows soaring 34m (110 ft.) to the vaulted ceiling, framed by the slenderest of columns. The windows occupied 1,672 sq. m (18,000 sq. ft.), or almost all the space where you'd expect the walls to be.

The roof is held up not by walls but by flying buttresses on the exterior. Inside, the profusion of light and the illusion of weightlessness astonish even medievalists. The architects (Juan Pérez and Maestro Enrique) who designed the cathedral in the 13th century were, in effect, precursors of architect Mies van der Rohe, 7 centuries before the age of steel girders draped with plate-glass curtain walls.

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