Bronze Doors of the Basilica of San Giovanni in Laterano. These 3rd Century AD doors were installed in this basilica during the mid-17th Century renovations carried out by Francesco Borromini. He took them from the ancient Senate Building (called the Curia) in the Roman Forum. There are now copies of these doors on the Senate Building.
Every valley shall be exalted, and every mountain and hill made low, the crooked straight and the rough places plain.
From Handel's Messiah: Part I