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 single person can open and close them with relat