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Show LONGEST STONE ARCH. The builders at work on a stone viaduct at Plauen, Saxony, over the river Syra, which contains the longest masonry, arch In the world. Its length being 296 feet 3 Inches, measured horizontally from base to base. The . Luxembourg bridge across the valley, val-ley, of Petruffe, which was completed a few months ago, has a span of 227 feet. The next longest masonry arch Is in the United States, near Washington, D. C. and is known aa Cabin John bridge. Its length of span is 220 feet. |