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Thomas Viaduct   (circa 1835)
Off Maryland Route 1 in Patapsco State Park
Baltimore, MD

Designed by Benjamin Henry Latrobe Jr., the 704-foot-long Thomas Viaduct, the oldest stone arch railroad viaduct in use today, was once the country's largest bridge and was the first built on a curve. It was named a National Historic Landmark in 1964.

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