Interior of St. Pancras railway station, the Eurostar terminal, showing Victorian iron girders and Eurostar trains, London, England, United Kingdom, Europe

Eurostar Trains waiting on platforms in the 19th century wrought iron interior of St. Pancras Railway station, London, England, United Kingdom, Europe

The Atomium, constructed for the Expo in 1958, in the shape of a unit cell of an iron crystal magnified 165 billion times, Bruxelles, Belgium, Europe

the Great Pavilion, Das Grosse Tropenhaus, Botanical Garden in Dahlem, Berlin.

Glasses, glass blowing crafts on display in a shop window, Roeros, iron mining town, UNESCO World Heritage Site, Sor-Trondelag, Norway

Palmenhaus greenhouse, historic iron structure, Schloss Schoenbrunn palace, Hietzing district, Vienna, Austria, Europe

Cooling tower of a power station, Duesseldorf, NRW, Germany

Detail of the glass-and-iron roof of the Galleria Umberto I in Naples, Italy, Europe

Glass and iron cupola of the Dali Museum, Teatre-Museu Dali in Figueres, Catalonia, Spain, Europe

Palmenhaus greenhouse, historic iron structure, Schloss Schoenbrunn palace, Hietzing district, Vienna, Austria, Europe

Façade, Palazzo della Regione new building, designed by Pei Cobb Freed & Partners, Milan, Lombardy, Italy, Europe

Detail, Palazzo della Regione new building, designed by Pei Cobb Freed & Partners, Milan, Lombardy, Italy, Europe

Façade, Palazzo della Regione new building, designed by Pei Cobb Freed & Partners, Milan, Lombardy, Italy, Europe

Spain, Madrid, Palacio de Cristal in Parque El Buen Retiro.

Spain, Madrid, Palacio de Cristal in Parque El Buen Retiro.

Spain, Madrid, Palacio de Cristal in Parque El Buen Retiro.