Our Pick
Posted on @rawstates
The Eads Bridge
1874
St. Louis, Missouri
Antony-22 · CC BY-SA 4.0 · Wikimedia Commons
James Eads had no engineering training and built the first big steel bridge in the world anyway, sinking its piers with pneumatic caissons that gave fifteen workers fatal decompression sickness before anyone understood the cause. To prove it safe he walked an elephant across, on the theory that elephants avoid unsound ground.
That was 1 of the hidden places.
Location: documented spot
This place has its own thread on r/rawstates
Read what people are saying about it, or add your own.