The Stone Arch Bridge is closing for the next two summers for repairs. It opened in 1994 as a pedestrian bridge, but has a long history before that. | TPT - Twin Cities PBS

It might not look like much — just another stone bridge out on Cockfield Fell — but this little arch helped shape railway history. Built around 1830 for the Stockton and Darlington Railway, Skew Bridge (or Swin Bridge) carried the line across the River Gaunless at an angle of nearly 60 degrees. Every single stone had to be cut by hand to form that perfect curve — something most engineers at the time thought impossible. Almost two centuries later, it still stands solid. From above, you can trace

Crafting the perfect stone orb #engineering | Interesting Engineering

Stunning treehouse loft built into stone! 😱 | Inspiring Designs