Inventions for Problems That No Longer Exist

History Photographed on Instagram: "The magnificent central bronze doors of the Archbasilica of Saint John Lateran in Rome are nearly 2,000 years old, but they were not originally built for the church. ⁠ ⁠ The doors were repurposed from the ancient Roman Senate House, known as the Curia Julia, and moved to the basilica in the 17th century.⁠ ⁠ Today, these monumental doors serve as the main entrance to the basilica. ⁠ ⁠ Despite their age and immense weight, they are so precisely balanced that a s