Huey P. Long Bridge
The Huey P. Long bridge across the Mississippi River just days before its dedication in 1935.  The bridge
consisted of four highway lanes and two railroad tracks.  At the time of its construction, it was the longest
railroad bridge in the world.  
A huge expansion project, completed in 2013, added to and widened the bridge's
highway lanes.  In 2014, a writer in The New Yorker described the bridge as "a structure so vaulting and high
that it seems to extend from one white, towering cloud to the next."
The first train crosses the bridge on the day of its dedication in 1935.
From a UPI press release at the time of the bridge's dedication:
"Longest bridge of its kind in the world - New Orleans points with pride to this bridge, which will be
opened December 16th and dedicated to the late U.S. Senator Huey P. Long, assassinated three
months ago.  The bridge is one of the longest highway-railway-pedestrian bridges in the world."