Eads Bridge · All Facts

Eads Bridge
Missouri's Eads Bridge in St. Louis, completed in 1874, was the first bridge to use <hl>steel as a primary structural material</hl> and the first to employ pneumatic caissons for deep underwater foundations — both engineering firsts.
SrcAmerican Society of Civil Engineers

Next evidence →YellowstoneWyoming's Yellowstone, established in 1872, was the world's first national park. The state has the smallest population of any US state — roughly 580,000 people — fewer than many individual US cities.

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YellowstoneWyoming's Yellowstone, established in 1872, was the world's first national park. The state has the smallest population of any US state — roughly 580,000 people — fewer than many individual US cities.
Independence HallPennsylvania's Independence Hall in Philadelphia is where both the Declaration of Independence (1776) and the US Constitution (1787) were debated and signed — making it the only building where both founding documents were created.
Great Smoky MountainsTennessee's Great Smoky Mountains National Park is the most visited national park in the US with over 12 million visitors annually. The "smoke" is actually natural fog created by moisture released by the park's dense vegetation.
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