Here’s the longest stone arch bridge in the world, the Rockville Bridge in Pennsylvania (Wikipedia page). It was opened in 1902 and (as you can clearly see on the linked Google map) carries heavy railroad traffic to this day. There’s a great-old postcard of the bridge at Wikipedia which claims the record of “longest stone bridge”. However the Anping Bridge in China is also made of stone, and has been around much, much longer. It seems that there truly is no end to the number of possible records to be broken. Thanks to Jonathan Hoppe and RJ Marquette.