In 1947, the St. Louis Arch was designed by the architect Eero Saarinen and built as a weighted catenary arch. Standing at 630 feet, the St. Louis Gateway Arch is the tallest arch in the world, the tallest man-made monument in the Western Hemisphere, and the tallest accessible bu ...
Read MoreThere are many different variations of a movable bridge, but they all have the same purpose; designed to move out of the way to allow the passage of boats or barges. Movable bridges obviously bring to mind "drawbridges", however, there are other variations of movable bridges beyo ...
Read MoreIn the early 1900's, the Missouri River was unmanageable, varying in shape and size covering entire valleys with ice and water, then resettling along a new course. The U.S. Army Corps of Engineers tried for several decades to tame the river and make it navigable for commercial, a ...
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