The Seventh Street Improvement Arches are a double-arched masonry highway bridge that formerly spanned the St. Paul and Duluth Railroad tracks in Saint Paul, Minnesota, United States. The Seventh Stre
The Seventh Street Improvement Arches viewed from the south
Detail of the ring stones and the entrance to the east arch
Detail of the ring stones at the top of one of the arches
Interior view of the helicoidal construction. The gray stonework at the bottom is the horizontal pier on which the arches sit.
Peter Nicholson (architect)
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Peter Nicholson was a Scottish architect, mathematician and engineer. Largely self-taught, he was apprenticed to a cabinet-maker but soon abandoned his trade in favour of teaching and writing. He prac
Portrait of Nicholson by James Green, c. 1816, donated to the National Portrait Gallery in 1961
Kielder Viaduct, information plaque