ASM International has designated Brownsville - Route 40 Bridge an historical landmark. This bridge, designed by and built under the supervision of Capt. Richard Delafield in 1839 to improve the "National Road", is the first cast iron bridge to be built west of the Allegheny Mountains.
Innovation designated by: 
Wikipedia
Brownsville bridge
Address:
Market Street east of Bank Street
Brownsville, PA, USA
Market Street east of Bank Street
