| 21. | Some feature progressive elements such as curtain walls, or retractable roofs.
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| 22. | The curtain walls linked two or more gates and several towers.
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| 23. | The rest of the bailey was surrounded by a curtain wall.
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| 24. | These are surrounded by a curtain wall, defended by polygonal towers.
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| 25. | The curtain wall is divided vertically by a central recessed channel.
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| 26. | A smooth curve of reflecting glass curtain wall approximates the pinstripes.
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| 27. | Published in 1961, it made exceptional use of glass curtain walls.
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| 28. | The first fortified building on the site ( a curtain wall.
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| 29. | The curtain wall was modified by the addition of new towers.
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| 30. | The curtain wall surrounding the castle is 1.4 m thick.
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